Moto748's 748E has 50000 miles on it. I think that's testament to reliability. He's not a thrasher but, it isn't garaged and is used in all weathers. The key, I think, to the reliability is proper servicing, regular oil changes with the right stuff, regular belt changes and so mechanical sympathy.
I'm glad you like your 748. It think they are wonderful and whilst they are somewhat behind Jap 600's in a straightline these days, all it takes is a few corners to put them in their place.