I've met retailers who won't even carry them because their quality is so horrible. I've never owned one personally so take this FWIW but every person I've ever talked to said they were garbage, wouldn't hold zero, fogged up, canted reticles etc. My reasoning in never buying one was if it gets that many consistently bad reviews it must be crap, I can't ever recall seeing or hearing a good review of one made for anything other than a .22 or air rifle.
Again I've never used or owned BSA (and I won't) so take this FWIW.
Sgt. of Marines, 5th Award Expert Rifle, 237/250
1st Award Expert Pistol, 382/400
D Co, 4th CEB, Engineers UP!! OEF 21JUN-20SEP2011