I've owned/used three of them fairly extensively.
I've taken all three out to 1,000 yards and back on numerous occasions. One is on my AR for my varmint carry rifle, and the other is on my 7mag LR elk rifle (sold the 3rd). Both have been used pretty hard, and both have help up very well. I consider them to be a bargain given what I paid for them, assuming you can live with the 1/2 MOA vertical adjustment on the turret.
Dave