I had a few problems with my servos and they sent 72MHZ instead of 35MHZ. However, they replaced the parts and threw in a spare TX just in case the crystal swap didn't work. They replied to all my emails and rectified the error. Some places just ignore you totally so I prefer to use them.

Another example was when they sent the wrong part, I told them and they sent a new part FOC and didn't want me to send it back! Nice.

All companies make mistakes, only some fix them.

Gordon