I'll just say that the NF/Tenebrax cover will barely fit, where the Butler Creek will not, on a 50mm shv mounted in Sportsmatch To84 rings on a t3x lite. On that specific combo, I'd say that after using them a few months I like the NF/tenebrax cover well enough to not mind what it costs. But if the BC would have fit, yeah, I would have used that.