lol... I started with a 901, moved to an 801...
Switched to the mini-pipe (801 atomizer with bigger battery), then changed to the e-cigar.
Then I went to the Screwdriver with an adapter to use both 901 and 801.
Then switched to a Prodigy with 901 and 801 adapters. Then bought a 510 adapter.
Now I use my Prodigy with 510 almost exclusively. I say 'almost' because somewhere along the way I bought the DSE-601, which I use occasionally.
Then yesterday I ordered a Ruyan pipe. Haven't got that one yet!
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[edit] woohoo! Just got my shipping notice on the Ruyan!
