The collar is lightweight and about as small as it could realistically be, which is a good thing because our cat's neck is tiny! Even with the reducer in place the strap is almost at its tightest. It fits well and doesn't irritate the cat.
I'm only 24 hours into using the collar but GPS results have been mixed at best so far. It's placed our cat out in the road when she was at the back of the back garden, and placed her 3 doors up the road when she was just outside our back door. Time will tell on this. The app is ok, does a decent job. The radio feature is good. Hopefully will never need to use it but I'm glad I have it. The only other thing I will say is that the reflective strips supplied as a paid-for addition do not stick. The first one came unstuck within hours. I'll update this review after more testing, with luck the GPS will be more reliable.