I have the 550 bought as a back up radio, never had any issues up to now.
Only let down was I bought it at the Sebring Sports Expo in January and it came with a mail in coupon for a $25 cash rebate, I never did receive it, anyway I took it up with the Yaesu rep at Sun n Fun, he assured me he would look into it which he did, he informed me I would receive a cheque within 30 days.....that was April we are now almost the end of July...no cheque..Oh well it's $25 I never had in the first place so I won't miss it...but it was a poor show to offer a deal and then not follow it through...