I really like the eVic so far myself. If you're using regular egos it is a big jump in size! Below is a picture of some sizes I found in my drawer of ecig stuff, might help you. If you're carring around a lot of stuff it might be easier to just carry one bigger device than lots of little things around. That's why I started getting into the bigger devices myself. Just replacing the battery inside is cheaper in the long run too than buying new devices.
If you vape the same ohm atties all the time then it won't really do much for you. I have a variaty of 1.5-2.2 ohm vivi novas I use randomly so VW means I don't have to change any settings at all each time I switch. I'd never go back from VW now either because of the ease of switching. I used to carry the provari mini around all the time and I have like 7 of the batteries from that still for the eVic mini. They don't really last me long and I think some of them are on there last leg too. I get a few hours out of each one, but I vape a lot too. The regualar eVic battery lasts me almost 2 days though so for me it's worth the extra size. Not to mention it shows the battery level right on the screen so you know how long you have left on it. I'm really REALLY loving that I can just see the battery level right on it! No more guessing or trying to remember when I switched the battery last time was. You can use the eVic as a passthrough too btw.
The new 1.2 firmware added more stuff you can tinker with too. Like programing how your vape goes threw it's vape time. Like I set mine to 11 watts for .5 secs to heat it up fast and then down to 8.5 watts for 4 secs and quickly ramp down after that. I'm enjoying that little feature a lot more than I figured I would. Time will tell how it holds up but I've always had good luck with joyetech stuff so I'm pretty confident it'll last. Not to mention I can't wait to see what they add to it next.
Ego Twist 1000mah(I think), ego-t mod mini tube, normal eVic with a viv nova on it, provari mini, vmax
eVic mini with a vivi nova on it, normal eVic tube
It amuses me to no end that I can check the time on my ecig too. ROFL