I'm with BJ. If the cat is chipped, then what value does the collar add?
Just beware, we tried to adopt through CPL, but found them very difficult to deal with. They kept trying to steer us towards unsuitable cats which had been in their shelter for ages. For example, there was the diabetic cat that needed daily insulin injections. When I said politely that I didn't have time for that, they basically said I wasn't taking this seriously, and if that was my attitude, did I have time for a cat at all!?
Oh, and then there was the "problem" of us living next to a main road (yeah, like ten cars an hour - Seriously!?), and the fact that I admitted that we don't keep our current cat in at night..... so in the end we just said we'd leave it.
However, a few weeks later, a stray cat adopted us. We haven't complained, and nor has he!