I think you'll def be happy with the Epowers.
For your question about the switches, there has now been 4 switches released since the Epower was introduced, mostly just to fix previous issues/problems. The first switch had a blue LED and rubber button. They worked well, but the rubber button would stick easily and/or fall out. So then they came out with the second switch. That switch was exactly the same except they replaced the rubber button with a hard plastic one. The 2nd switch worked well and was what came with Epower kits for quite awhile. The first 2 switches were both rated to use 1.5ohm and up.
Then this is where it gets alittle confusing. About 4 months ago they decided to bring out another switch which had a white LED and 5-click on/off feature for the first time. This is the switch that have the Epower a bad name for quite awhile bc Smoktech totally screwed it up. For some reason they made the white LED switch rated to use only 2.0ohm and up. This caused a huge problem bc many people bought them since that was the first switch that allowed you to turn the unit on and off, but then quickly realized that they wouldn't work if you tried to use anything below 2.0ohm. This ...... alot of people off bc the older blue LED switches worked great with 1.5ohm, 1.7ohm cartos, but now with the white LED switch they wouldn't work. So that's when many people stopped recOmmending the Epower bc most kits were coming with the white LED switches, and that meant you couldn't use anything low resistance. QuIte a few vendors went back to the 2nd gen blue LED switches and put them in the kit instead of the white LED switches. While they didn't have the5-click on/off feature, at least they worked well low resistance cartos. So then finally about 2 months ago, Smoktech brought out the newest switch, which is the one available now and the one that comes with the Epower kit from Sweet-vapes. This switch was basically just brought out to replace the white lED switch that they screwed up so bad on. The newest switch has a blue LED and is rated to use 1.5ohm and up, like the older blue LED switches, but now it also has the 5-click on/off feature like the white LED switch had.
The newest switch works great and fires the 1.7ohm Ressurectors, 1.5ohm Epower dual coils, etc. yOull def be happy wih the Epower, and that's one of the reasons I recommend you get the Epower from Sweet-vapes, bc I know their kits come with the newest switch.
For the question you asked about the batteries earlier, neither the 1050mah or 950mah "high-drain" batteries are AW batteries. Regardless they do work well and I have both of them. The 1050mah batteries are the regular ones that cone with the Epower kit. I get on avg a day to a day and a half on one battery. I generally just pop in a fresh battery every morning before I go to work, so I never really let them drain all the way down, which is better to do anyway bc the batteries will last longer that way and you'll skip the big drop off in performance that you get from using a battery that's almost completely drained.
The IMR "high-drain" 950mah batteries also work well. Since they are LIMn batteries, they are a safer chemistry, which means they don't have a Protection circuit in them like the 1050mah batteries do. Since they don't have a built in protection circuit, they are ever so slightly shorter than the 1050mah batteries. They are both still 14650 batteries, but the protection circuit makes the 1050mah ones a tad bit longer. you might not have to do this, but for my Epower I noticed that I could hear the high-drain battery jiggling around slightly when I shook my Epower. It still makes a connection, but since it's a tad shorter it just doesn't push up against the switch as hard. To stop that from happening all I did was take the spring out of the bottom of the tube wih a paperclip and VERY carefully stretched the spring a TiNY bit, like 1/16 of an inch. Then put the spring back in and try it again. Doing that will make the high-drain battery sit a tiny bit higher which makes it push against the switch harder and it won't jiggle around. Again, you don't necessarily need to do this, but if the high-drain battery doesn't make a great connection this is how to fix it.
"high-drain" batteries basically just provide a more consistant voltage for longer. So when used in an unregulated PV, there won't be as noticeable of a drop off in performance as the battery drains.
Like I said, I've got both batteries and they both work well. Honestly I really don't notice much of a difference vape performance wise between the 2, if any at all. I have 3 of the regular 1050mah batteries and 1 of the IMR high-drain batteries, and I just rotate through them. They all work well and personally I don't think the 950mah high-drains work any better than the regular 1050mah batteries. 2 of the 1050 mah batteries that I have are the original ones that came with my Epower kit. I've used them daily for about 7-8months now and they still work awesome and last just as long as when I got them.
So I really don't think you could go wrong with either one for the Epower kits. If it were me I would prob get the regular 1050mah batteries just bc they will last alittle longer than the high-drains before needing a recharge.
Hope this helps!