I use one of the aluminum versions that are out there but I don't use the palm supports. With the palm supports, it's difficult for me to "find" the sides of the transmitter as a reference point for locating other switches. Here are some of the reasons I like the tray (and not the strap):

1. The tray doubles as a transmitter stand when you are in the pits
2. I have bad allergies and in the summer usually need get my hands free momentarily
3. Better for handlaunching electrics
4. I'm a pincher flier; can't hold the transmitter good with two fingers on the sticks
5. I have bumped the throttle attaching the strap; probably should have left the strap on the transmitter
6. Loose strap on the neck gets in the way of the prop; same as above!
7. My 10 year old is using a tray too and its hard to jump in and help him at times
8. The palm supports get in the way of the charge ports on the side of the transmitter; charge port in the rear on some older JR...thats a pain too.
9. I LOVE the ribbing everyone at the field gives me about my tray, its constant
10. The tray hooks over the top of a bucket seat really nicely for holding your transmitter while you drive
11. One hand is always free to gesture to your friends who are mocking your slow roll skills

Hey, thanks for the fun thread!

Tom