I replaced my 15 yr old Innotek last year. It finally died but I was very impressed with the service I got from that $150 collar; came out to 10 bucks a year and it was used heavily for most of that time. There was a couple years in the middle when I was between dogs but impressive anyway.
I replaced it with a Sportdog collar and have been happy with it so far. It's been used most every day since I got it (4-5 days out of every week) and I havn't had any issues. I also have a Sportdog bark collar and it has also worked well, no issues. We'll see if I can get 15 years out of them; I'm not holding my breath, that Innotek I had probably set some kind of record.