I started in LE at the end of 2007. My first holster was a horrible uncle mikes universal holster. Sadly I was a holster moron and apparently no one else had the ability to instruct me about making better choices holster wise. Then I went to a new agency and got a 6280, went to a Serpa (still a holster moron) and eventually got some sense and moved to the ALS platform for good.
I prefer an ALS, but would use a high quality thumb break if issued one. Would never use a universal, 6280, or Serpa for serious work again. The SERPA would not be used for anything.