I just ordered one -- I already have a SD9 -- at what I think is a good price. (I look for bargains, but once I spend money on cars, guns, stuff, etc., I never look back. There ALWAYs is a cheaper price, but often there is a hook to it).
My SD9 is very nice -- I expect the SD40 to be the same. Lower quality? Not at all - compares favorably to my M&P 9, 40, and 45. And its a S&W, so it is backed up by the best customer service (if needed) in the business. The materials, fit, and finish are excellent.
You have to keep in mind this is a striker-fired gun and will never have a trigger that is like "breaking a glass rod." I have lightened and improved the triggers on the M&P's by adding Apex hard sears and universal striker block kits -- there is, at the moment, nothing comparable for SDs. The SD trigger pull is, as you know, relatively long and heavy. (This is a much discussed topic -- I raise it here only to point out it is not a QUALITY issue, it is a by-product, to some extent, of the striker-fired design, and, to some extent, of S&W's engineering for enhanced security in what is billed as a self-defense weapon).
Enjoy your SD! This is one of the best values-for-money on the market!