I haven't heard any problems w/the Guardian limbs, but the 07 Allegiances allegedly are having cam clearance issues. A word from a proshop is that BT rejected a batch of limbs. Some may have got into production. Their customer service is very good. I own an 06 Tribute & am very satisfied/excited with it. The Guardians are behind in production. A friend of mine was very lucky, & bought his outright in Jan, from a proshop that actually had one 2 sell. He also is very pleased w/its performance.