Randall... yep... I immediately took back my "love-hate relationship" statement in my posting.
But it's useful to be reminded that these cars can be temperamental at times -- not related to age -- because of their components. A new car, run essentially by computers, are more consistent in their performance (electronic fuel injection, etc., etc.). Of course, when a "new" car goes down, the repairs are going to be time-consuming, costly, and often difficult (Take replacing an air bag, for example!!!).
No matter how much we love these old cars, and no matter how basic ("Primitive") they are, an owner needs to be prepared to spend time working on them, more so than a new car. And as I had one of these TR3s back in 1962, I can say that it was the same back then when they were "new."
All that said... I wouldn't trade my '58TR3A for anything else.
I think Randall "wrote the book" on these early Triumphs (or at least should write the book). But I think Poolboy had it right: "Go into this hobby with your eyes wide open and you'll enjoy the ride."