I've only owned one Serpa, and it's still going strong 10 or 12 years later. Can't say to other modles, but the 1911 Serpa fits well. Poor concealability, however is correct. Not as bad as the ALS, but they do stick out. This is why I carry with the Bravo Concealment now. In fact, Iv'e been using my new Vickers Glock 17 over my 1911, because I haven't made the effort to get a Bravo Concealment rig for the 1911 yet... I still trust the Serpa, but I can no longer live with the bulkiness... unless I just don't worry, and OC, but I, mainly CC.
I mainly CC as well and with the weather change this is difficult.