To specifically answer the original question. Yes, it's a damn fine weapon and for the price, if it's in good condition, it's an excellent buy. If for some reason you purchase it and then decide it's not right for you, there would be no problem in selling the gun and making a tidy little profit. Blue Book value is 100% NIB $650.00, 95% $410.00, and last MSR was $822.00. This is a traditional double action with ambidextrous safety 4 1/4" barrell, 8 shot magazine, and was manufactured from 1990-1999.
BTW, for those Sigma haters, it's the considered opinion of most gunsmiths that the Sigma series actually has a much better trigger than the more popular M&P models. Also the Sigma has gone through a renovation and is now called the SD model. The only changes are purely cosmetic.