In my experience, ive had a great experience with all the DPS instructors. (When did it change from DGS?) I've only had 2 instructors rub me the wrong way and they were both SLI guys. One guy was my first recurrent checkride on the ER, and it was just me....I had the 75/76 fleet training Captain (GP back in 2009)as my captain seat filler. During the brief, this SLI was trying to convey to me how important he was doing a bunch of name dropping of senators and congressman. He had some position in ALPA and spent a lot of time on Capitol Hill. Then during the checkride, I was literally single pilot, because my seat filler wanted to make sure he didn't help too much, by not helping at all. It was a pretty bad experience, after only being on the fleet 9 months, but I made it through. The next recurrent I was absolutely dreading, but it went so smoothly, and the instructor was great again and I decided I was really going to like the fleet and my first experience was a one off.