So I have purchased in the past 4 years 13 Wireless receivers, 3 hand helds, 13 packs, and one wireless adater. The first install was the intial 10 I purxchased 4 years ago and as luck would have it the company installing the sustem chose the "c" range..the 700 range!!!! So now ai Have a 2,000 dollar rebate offer on the table from Sennheiser with an overall cost of about 6330How worried should I be? everyone I have talked to has said they are "waiting to see." I dont want to power up one day to hear nastyness all over the place and be stuck. I just dont know what to do. Thoughts!?