Definitely worth getting one. They are great. I have the Melt and the InsideOut. Both are great but the Melt is one of only three toys that is always kept charged and to hand. Highly recommend it.
Definitely have a read through the topic @PKH linked. Really useful information in it.
Also, there is a summary table @Ian_Chimp created here.
ETA I’ve updated the link as found the more up to date one 