Having flown the PA 28 range for the last 11 years, I'll agree with the comments about "They do exactly as it says on the tin" My first experience of spinning the PA28-140 was during my initial instructors course.
My biggest problem was getting the flaming thing to stay in! Previously I'd only ever spun Zlins and you've only got to think about spinning and in she goes. The placid little 28 flipped over on her back then decided that as I hadn't been firm enough with the entry, we'd go towards Vne with the yours truly holding in a boot full of left rudder. Nice.
I recently flew a 28-140 with a roof trimmer for the first time in about 3 years, and the lesson was trimming, and the effects of flap and power. Enough said!!!!! Not the best lesson I've conducted.
I mainly teach now on PA38's. Trimmer, well, it's got one, and as for the spinning................................ Nah, not today!
For my money, you can't beat a PA 28 for teaching.