Well your opinion is certainly valid and I agree, Arch, but on the other hand I think a gyro may also be profitable to the more experienced users.
Like all MZ fans I always tried to tune my cars to their best, and I would certainly do the same with the dnanos, what I like with the gyro is that it will "smooth" an already touchy car by nature (due to its small scale), erasing the imperfections of the track surface and make it feel like it was a bigger scale, thus pushing it to a higher level of performance in addition to an already correct setup and good driving skills. I agree this to be a kind of cheat or artificial technique to make it perform even better, but eh, its working, its there on the open market and some of your competitors may have one under his shell
I have a gyro on my Murcie and it is my only car using one.
It all depends on the conditions if I may use a gyro or not. On carpet I definately will. But in fact my favorite place to run these cars is on a 10'' wide lane track (painted wood) with the stock motor, stock tires, and no gyro
Also, I doubt that the gyro would give any advantage on RCP and other foam type surfaces. It is basically and anti-skid device...