The ZR is a cracking "fun" car. I love mine to bits, and although I dream of say V6 power at the end of the day its 2010 and petrol isn't getting cheaper. The ZR 105 is a good all round compromise on price and performance when you look at the Zed range and for me its a cracking day to day car.
The ride though, is something you either love or hate - it's firm, VERY VERY firm but to be honest on a motorway in the 105 its fine, I appreciate the feed back you get whilst driving as your really do get a feel for what the car is doing but on badly surfaced roads you will swear quite a bit at the local council. Speed bumps, best take them at 2mph lol
The ZR was never meant as a track car and will understeer if you cock about too much but you 'll take corners faster than most hatch backs on the road and body roll is something of next to no worry. In its class, the 105 was one of the best handling cars but they achieved that by making it rock solid on the damping front.
Cheap to run, and the early ones are the ones to nab for build quality.
If I were getting another ZR, it'd be the oil burner - very similar to the ZR 105 but with a higher top end (Who in their right minds will be doing 115mph + anyway!) and better fuel economy.
Not about to sell the ZR anytime soon, the plan is to lock it up and get and oil burner in 4/5 years time.
That's pretty much my opinion on it, try one see what you think. Personally, I think they've got bags of character, one of the best looking 9 year old cars on the road and hold their value pretty well.
PS:
If you get anywhere near me, let me known and you can take mine out for a drive