Depends.
If you decide you prefer them over what you're using now, nope.
If they're going to be vapocalypse box items, maybe. A few extra poly center sections, maybe some extra M5 (full poly tank piece), assorted o-rings, and some rebuild kits (screws and insulators - FT) all you need.
Unless they're shiny.
Thanks. that was exactly the info I was looking for. I'll try to pick up those parts you suggested. Can they be picked up locally? I've never used FT.
I just got these tanks for fun. I've read so many threads where people were praising them. My long term plan is based on a box full of Protanks and Lemos. Didn't spend much money on that, there were a lot of sales of both. If I really like the KFL's and they are still available I might grab a few more. Can't go far wrong at $10 a shot.
There is something else I need to look into, that being coils for the KFL. Is there a thread around where I can find ideas on what coils to use?