Crashlytics (now owned by Twitter and rebranded as 'Fabric') is great. I'm surprised you thought the integration was tricky as it's the most simple setup I've seen. You install a menu bar app that literally walks you through each step and which automatically grabs your archives (when you archive a build) and lets you send it to testers in a couple of clicks.
We also switched to crashlytics. I like their flow for new testers, they do not have to create an account.
I've been using Beta by Crashlytics as it is nice and cross-platform and works with ios7. Downside is the integration process and management console are a little tricky.
http://try.crashlytics.com/beta/