I have the warranty, and it has absolutely paid off. I have had three tires ruined by nails, and all were replaced without issue. I too had the same one replaced twice (within a month), and never an issue with the claims dept.
2015 SSII F80 M3 | M-DCT | Dinan Stage 2 | Supersprint Mid-Pipes | Dinan Exhaust
2013 SG F10 550i | M-Sport | 6spd | Dinan S3 Tune/Exhaust | ACS Springs - Sold
2011 AW E92 M3 | M-DCT | Dinan Exhaust - Sold
2008 SB E92 335i | 6spd | Dinan S2 - Sold