One of the Cruzbike gurus put it best, the Cruzbike kit is the closest thing tinkerers have to bike Leggos.
It's one kit that fits all. I've had mine on two different bikes. I think Defjack has had his on four. It does absolutely no irreversable damage to the bike, so if the frame doesn't suit you, or you just get bored with it, you can put it back to a regular bicycle and put the kit on something else. Pretty cool, them bike Leggos.
Mark
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Bicycling is my drug of choice. Followed closely by beer.