I've seen here that some recommended the big baby rba, since i have it here and using it right now thought i'd add my 2 cents.
Firstly i DO NOT recommend this to anyone that's a beginner or new to rta,i bought the big baby tank by itself and came with the rba base,since i went through both included coils i got some cotton and whicked that thing up, flavor is very good with moderate to big clouds (depending on how you puff on it i use 6mg so i mostly do short puffs)
But i cannot see myself even attempting to rebuild that thing since it's clearly and extremely small ,where' as most rda and rtas i've seen have at least big enough decks to build properly on them. Also the rba needs a seperate glass (comes in the box) to fit the tank,and leaks alot but i've done my research and seems ALOT of folks are having problems with so it's most likely a manufacturing issue (i've seen shorts issues,leakage,0hms jumping etc) all because the rta dosen't sit very nicely in the base and pushes the 510 pin to it's max (it dosen't spring back) so it's probably suited towards hybrid caps otherwise you'll have a gap between your mod and tank like i do.
Overall a nice rba to try at least whicking it but i can't see myself using it longer than i have to,since there's too many negatives about it. Imho if you buy the big baby stay with factory coils, sure they don't last longer but i've had 0 issues besides that with those.