i was in same boat as craig, had my 120 for 5 years before i got my zs. totally different cars and tbh honest i like them both for the different way they went about the same job, loved it that my wee zr felt frenetic but still fun and loved it on the twisties round where i used to live....the zs is the same fun just slightly mair civilised but would still gladly rip the heads off small kittens if they sat there looking too cute
as said the main issues zs wise are plenum & vis going ker-plunk but also check the clutch master slave cylinder as these go, i will have one sitting spare shortly as i bought the upgrade kit you can get form sheddist over on xpf and just need time to get the ****** fitted
they are the main issues, other than that check horn works and the alarm isn't drowned