I had one for 3 years, barely put a foot wrong. Diesel estate though. Would have thought the petrol fairly bombproof given it’s likely to be fairly low mileage.
If comparing spec go for design spec over SRI, SRI might be top spec but it’s very spartan. Cruise control an easy add on afterwards if you wish which is very good. The wing mirrors are really crap they just self destruct, loads of astra’s have them cracked and hanging off. Thankfully they have black trim around the colour coded bit so you can bodge with insulation tape and no-one will notice 🙂
Google will reveal the common faults, the only problem I had with it was both rear springs snapped around 80k which apparently is common, worth checking those. Mine did spend a lot of it’s life lugging loads though. I’d also say if it’s got a few miles on check water pump and cambelt (if it has one) have both been done, vauxhall recommend every 80-100k depending on engine which I think is optimistic. They looked at me funny when I told them I wanted mine done at 60k and it wasn’t due for another 40….