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Not serious. It's actually pretty hard to gauge what people mean by very reliable, it's all relative. I have spoken to the owner of an '88 XJ-S which put me right off.
I'd always thought even slightly older Volvos/Porsches would be more reliable than that and that's probably a wake up call too. I like the idea of owning various cars but not sure I really have the time/money/inclination really for anything fun :(
I hope your Porsche requires less time/money/inclination in the near future.
Fox-
I had a 1986 4.2 XJ6 (similar mechanicals I guess) for a couple of years 2011-13. Did 6,000 miles and not a thing went wrong, air con, trip computer, many electrics, all working perfectly.
There was a hole in one of the fuel tanks, but I just used the other one.
If you fancy one, get one. If it's a pain just get rid of it. It might be awesome...
Hefty
I think when comparing 20 year old vehicles level of reliability the Volvo and the Porsche don't come out badly at all, they require stuff to be done- although not very much now- but so will any car of this age and mileage. If you buy a mid nineties car don't kid yourself that you'll escape the requirement to extensively service and fix.