I've just ordered your Discus X.
Firstly, these planes are AWESOME. These are the best gliders I've ever used on FSX. They handle very well, and the C4 is very well rendered.
But I must admit I'm a little bit disappointed.
First, when I saw your trailers, I thought the PDA thing was a very good idea. It is very helpful to track our course not to deviate from thermals. But, I was very disappointed when I tried to use it. My FPS drop from 30 FPS (limited) to 15 at the best. Also, I could notice very annoying stutters appearing every second and a half. I know FSX don't handle virtual screens very well, and I understand it lowers FPS. But I fly PMDG planes, and even the Flight1 Mustang with a "full" featured G1000 and 3 enormous panels without those stutters.
I've got a quite good hardware (i7 2600K, GTX580, 12 GB RAM, FSX mounted on a SSD) and I have never faced such annoying FPS drops. Maybe you could help me a bit finding out what's wrong with my settings, or maybe you could optimize this device so we can just use it !
Also, it appears that I can not tune the com frequency on your gliders. I use the mouse wheel. The knobs turn but the frequency does not change. When I force it to change with the FSX ATC menu, I can not talk on the frequency, just like if COM1 was offline. It wouldn't be a problem if I only played solo, but I'm used to talk with my friends through local COM radio calls, and we want to glide together !
Here is a little video to show you. Maybe I'm doing it wrong. This video is private (only accessible through the link) and is only intented for troobleshooting. I'll remove it as soon as you want.
Sorry for my bad english.