I'm considering replacing my gyros and eliminating the vacuum system and I'm seeking input from those who have used RC Allen instruments. A high end IFR GPS is not in my plans, and probably will never be for this aircraft. I don't feel I need the added features of the G5's. As a result, I'm considering the RC Allen 1510 and 2610. I realize there is no cost savings with the instrument itself, but install cost is markedly cheaper. Has anyone used these instruments, and if you have, what are your thoughts?