I have two optic 6's and they both work great. They are my main radios, one is for me and one is for my dad. Has plenty of programable features for aerobatic 4 channel planes. The only complaint is the handle keeps breaking. I sent it back to replace the case and and got it back about 4 days later (great product support!) with a new case. Handle broke again 3 weeks later. I just decided to epoxy it back together and haven't had any problems since .

I myself don't have the X100 but do have the X50. I must give my complimants to the plane as it flys great, once setup right. I am sure the X100 would fly even better.