I have both! Well.. I had a Razor and still have the Matrix. The Matrix (to me) is a much better flier. It's a few inches bigger in both directions, has more wing area and significantly bigger control surfaces. It flies much 'lighter' than my Razor did due to the lower wing loading. I bought the Razor used and it was not in the greatest ship to begin with. Some of my problems with it I'm sure are associated with its past. My biggest complaint was it was extremely snappy even on mid elevator rates. While it's snappiness was good for some manuevers, it was by no means relaxing to fly. It's snappiness eventually led to it's demise. I actually smacked it twice; the first time was a minor repair, the 2nd one totalled it. Again, mine had a few shady repairs made to it. I wouldn't read too much into my experience with it as I didn't start with a clean slate. I absolutely love my Matrix. It's everything I wanted the Razor to be (and probably would be if it was right). Both will do mesmerizing blenders and inverted flat spins. Parachutes, harriers and elevators are great as well. Mine is absolutely rock solid in an inverted harrier. Upright, there is some wing rock. I would highly recommend a 4 stroke provided you can keep the weight down (I use a Saito .82). As for tank placement, I had the Razor's tank mounted behind the firewall. On the Matrix I used a Cline Regulator and mounted the tank on the CG. I HIGHLY recommend the CG mounted tank if you can swing a pump or regulator (you will need one). The build is very straightforward and relatively quick. The bellcrank setup can be a bit of a headache and I would HIGHLY recommend a high torque servo for it (for the price, you can't beat a Futaba 3010 on 6v). When set up properly, it works extremely well.

My best suggestion is to keep it light! But do NOT sacrifice on power if you can. Let me know if you have any questions. [8D]

Abram