3 no and an eh
You have obviously been trying to use Google to find an ecig and all you do then is pull up the best marketeers and their bs "review" sites.
Prosmoke - I believe this is like M401 and e-Health with a tiny annoying juice cup down in the mouthpiece you have to push up with a paperclip to add a meager few drops of juice to.
Red Dragon - KR808D-2 which is incompatible with the popular and near-identical KR808D-1 version (KR808D-1 is all of these: V4L which is best for longer drags, and the rubberized models Smokeless Image, Bloogplanet, Halocigs G6, and normal manufacturer KR808D-1 by Kanger, and other KR808D-1 models and all of the 3rd party style of blank KR808D-1 cartomizers, and DSE901 atomizers for testing new juices)
The Safe Cig - RN4081 which is a 2nd tier model with almost nothing interesting available for it except a couple of kinds of blank cartomizer. It's an OK starter model (though I recommend manuals if you expect to be refilling cartomizers). While OK for starting it has little variety available for it compared to the popular models.
Blu - probably one of the most despised ecigs here. Weak very weak choice. 90mah batteries mean you may get an hour of vaping. Basically it is 1/2 as good as a Joye 510 and Joye 510 is the weakest model I recommend.
If you want a slim ecig I recommend
Joye 510 manual and once you find some thinner juices you like switch to Boge 3 ohm cartomizers for your favorite all-day vapes. The cartomizer replaces both the atomizer and cartridge and makes its proportions more like a cig and filter (cartos as well make it a more consistent vape and are what most prefer). NiteLiteVapor.us has Boges in tan and white as well as the common black. Charleston Vaping has the best PCC charging case (looks much like Blu's - that style). And on manuals you can use a 510 drip tip on the atomizer to test juices). 180mah and 100mm long w/ a cartomizer.
Or for stronger and with lots of prefilled cartomizers - see the KR808D-1 models I listed above. Again I recommend manuals (harder to damage or kill with juices leaks, much easier to get a good hit every time). Most here use and recommend manuals. On a manual you can use a DSE901 standard resistance atomizer and drip tip (see LiteCigUSA.net) for testing juices. I recommend the standard aka 78mm batteries for a 120mm ecig w/ carto, 280mah charge. But if you want smaller you could get the smaller batteries (shorty, 65mm) to make a shorter ecig 180mah.
And many use a drip tip as mouthpiece on the cartos of both instead of the endcap - keeps your lips cool (you will need it with V4L cartos), easy to remove to check stuffing or with carto off battery to add juice.
