Yup, I have one, too (P225/P6). Paid under $300 for it with a second mag, and the mags go for $45 or so, when you can find them.
The P228 is the "Fed gun", adopted by many federal agencies. 9mm only, it's a great weapon with great balance, and the original isn't cluttered up with a frame rail or "tactical" square trigger guard. They've recently brought out a few "new" P228s which are built of P229 frames (with the rail and square trigger guard).
The P229 is the newer version of the P228 with the tactical touches, and supports .40 S&W and .357 Sig on the same frame.
Personally, I'd jump all over that WG P228 if I didn't already have one. It likely has a carbon steel slide. The new ones have a blackened stainless slide, which is better in some ways but worse in others. The WG guns are almost always better than the US guns, IMO. Some like the newer US models due to particular updates, but if you want the gun that made Sig famous, get a German one.
-- Sam (also a Sig fan)