Tbh I've always found them to be very reliable. I'm currently on my 6th and 7th! They're not engineered like the Lexus/Toyota/Honda stuff but they are easy to fix and unfortunately since I had Lexus and Toyota everyone else seems to have caught up and the market's gone a bit daft.
Since selling the LS 400 I've had an MR2, BMW E39, an Alfa GTV and now back into Saabs. Very happy with these two so you never know, I might keep them