Tayside have been promising an AOPA course for a while to my knowledge cannot yet actually put one together for you. I think the problem is more a specific AOPA Aeros FI bit of paperwork as the Dundee Instructors have excellent standards. Some have to be vetted by the RAF CFS for the Cadet contract.
From a PPL point of view the Grob's are truly excellent. If you can persaude Tayside to part with one for a day or for a weekend then they make very swift tourers. I wouldn't want to land one on grass (spats etc). Plus side, superb vis, 3.5 hrs plus 45 mins reserve. 120 kts cruise and soooo nice to fly.
They aren't as sharp as a T67 on aeros, but they are more roomy. A downside is that 4 of the 5 have military radio jacks and seat cushions where the parachute is. If you can get Grob 5 then you get comfy seats and you can use your own headset.
Interested to see the poster didn't think much of the service at Dundee. You should try Glenrothes for a friendly welcome (not!).