Yeah, they're worth it. They are very good optics and Trijicon will stand behind them. The BAC is unique to them.
I've personally never used BAC ACOGs. I have used OEGs extensively and they work quite well for me, so I believe the BAC would as well. However, I like low-powered optics on these sorts of rifles and 3x-4x is a bit high for my tastes. The mini-ACOGs with lower magnifications also have rather short eye reliefs, which is an issue for me.
The only reason I never bought an ACOG for either my HKs or the XCR was a combination of the fixed magnification and eye relief issues (more on the HK side there).
I've personally never used BAC ACOGs. I have used OEGs extensively and they work quite well for me, so I believe the BAC would as well. However, I like low-powered optics on these sorts of rifles and 3x-4x is a bit high for my tastes. The mini-ACOGs with lower magnifications also have rather short eye reliefs, which is an issue for me.
The only reason I never bought an ACOG for either my HKs or the XCR was a combination of the fixed magnification and eye relief issues (more on the HK side there).