I have had the blu, and i personally didnt care for it much. it got my foot into the door for electronic cigarettes, but with how often i vape i didnt like having to plug it in to recharge all the time. by the time the charging battery was done, the one im using needed to be recharged.
Id suggest looking to see if you need to have something that looks like a cig, or if you dont mind something larger (about the size of a highlighter roughly for battery) then id look into what others reccomend for the size you want.
the initial hardware cost can be shocking, but depending how mant carts you use of the Blu it could pay itself off pretty quickly. since its $12/5 pack ofcarts online for a single pack, or as low at 9.60/5pack if ordering 4 or more packs.
Buying juices is cheaper, and even cheaper if you get into DIY mixing. then its just finding the battery style you like, and a way to vaporize it that you like and you are vaping away happily while saving money.