Cisco REP deployment for a partial ing topology and STP spokes

Just wondering if anyone who has used Cisco REP has benefitted from the design and would do it again?

Has anyone had it working with 3rd party (Wireless Relay) spokes with STP turned on, even though there is no redundant path back to the main ring. Just accident prevention.

Currently looking at this on Cisco recommendation for a in-place upgrade.

Thanks