Purchased and tried both the Tib8 and the TPX. The TPX won for me, simply because of the weight and how much cheaper the magazines are. The Tib8 looks really cool though.
I preferred the TPX because of the weight, that's about it, there really wasn't much in it, really.
Edit - I liked that the sparklets were in the Tib8 magazine too, forgot to mention that.
Just read that review richie, nice, thanks, raises a thought tho, how the hell can you use it a fast paced woodsball game for example when the sparklets have such a short life.