I have one; the only thing I don't like about it is that the circles on the reticle are way too big for shooting at 400 and 500 yards. Other than that the glass is good on it and the zero has always been repeatable.
If you're on a limited budget, the P-223 is a good deal. The P and M series appear to have the same tube just different quality glass.
Hk USP 45 Expert, USP 40, USP 9, SIG P226, S&W M&P9, Hk 4, Makarov, Desert Eagle 40, Beretta FS92 Centurion, Kimber TLEII 1911A1, Glock 22, SIG P225, 1943 Rem Rand 1911A1, S&W mod 64, Walther PPQ, SIG P229, Browning BDA 45 (SIG P220), Hk45, SIG P230