I've only had one claim in two years with them. On that one, I had no problems, and my client had nothing but good things to say about the whole process.
They didn't pay on the resultant water damage, but did pay very quickly on the A/C repairs and service calls. And the AHW claims person was very professional to me.
It's like a lot of services and products - it's not for everyone. I'd recommend trying it, and if you have a claim, keep close tabs with your client and get their feedback on the claims process. If it's bad, dump it.