I had a 50 anniversary and didn’t like it much(other than the paint)
Have a 17 SV and love it. Like you said I wish it was a manual but it’s 2 prize. I prefer it to the gearbox I had in my f12 that was butter. I like butter in my luxury cars. The gear box in the SV sucks when it’s cold, but in LA not a issue. Also in traffic it’s ok when it’s up to temp, but not ideal. However for spirited driving I LOVE the gear box in the SV in manual mode(if you have to have a manual). I’ve had zero problems with mine to answer your question.
The only problems I’ve had is the CEL is on 50% of the time at random times, I took it in to service was told was a software issue. And was fixed, 20 miles later it was on again. Car isn’t missing shifts, running funny, seems 100%. So I ignore it.
The rest of the lights on the dash, which I have no idea what the hell they mean seem to light up like a Christmas tree now and then. Again I ignore them. Car has the right amount of power, no issues starting, steering is fine. I push it reasonably hard at times and everything is just fine.
I had the same issues with my Diablo’s, Murci, Gallardo’s every Lambo I’ve owned. And been fine.
I do l8ke the gear box in the 17 SV much more than the 50th. I mention this because to me this is the real question, not so much reliability. I think you’ll have your typical Lambo owner experience in what ever car you choose. And I respect your experience.
On another side note the SV hasn’t taken a price hit yet, that’s coming soon with the new car coming soon. So if you decide on a SV which I can confidently say you’ll prefer over a regular Aventador now isn’t the time to buy a SV. I like mine so much I’m holding it, or I’d sell it now and make a deposit on the SV-J.
Go drive a SV and others to see what appeals to you. Not worry about the reliability of the car, you owned plenty of lambos and know the deal.
Hope your well, looking forward to see what you buy