I haven't even seen a matrix around here but that doesn't mean anything really, however if your looking at the caster and the hyper I would really pick one of those and did you see that they had that one on there that already had a bunch of hop ups? http://www.holeshothobbies.com/servl...EAM-KIT/Detail

If I had the extra cash I would get that in a second...... But I've been wanting to try one of these out after hearing so much about them... I personally run Kyosho and Mugen but I've run about everything out there and I'm actually switching to Hot Bodies as soon as the D8 comes out... I really like the way that buggy looks but, it won't be out till august.. Oh also If your looking more at the Ofna you might want to wait a few because they have the new Hyper 9 coming out pretty soon also... I think Caster is going to be on this design for a while but who knows really... Ok I'm done rambling now LOL.... Hope it helps...