There are only three items that come to mind when I think of what is 'wrong' about my '95 Sprint. None of them affects the bike in motion so they are more annoyances than systemic problems.
One: I have reached that mile stone of many fellow Sprint riders my ignition system failed. Prior to the failure, the only start up problem I had was a drained battery from long winter rests. The blessing of ignition failure is that the bike is not in motion when the problem arises, except if you stall from user error (as I did), and the system decides to quit on a trip, you're walking or waiting for help.
Two: If I leave the Sprint in the hot sun, no shade and high humidity with a half or less tank of fuel, the choke doesn't work properly because a vacuum seem to be created. If the vent on the tank is whistling like a banshee, I now open the fuel lid to release the pressure. The back pressure created stalls the bike within 200 feet of the starting point. Open the fuel lid, wait a couple minutes, and you're good to go with no more stalls.
Three: The kick stand switch gets stuck. When the stand is put up, the switch doesn't completely extend this, then shuts the bike off as it is put into first gear and the clutch is released. On dryer days, here in Virginia, the switch is less sticky. I have a habit now to check its extension and pull it out, if need be, prior to engaging the clutch / gear sequence.
This is the second motorcycle I have owned, and I did a fair amount of research prior to the purchase. I find it to be a comfortable bike due to its height (I am 6'-1"), seat and handle bar height, but on a long ride, 250 miles or more, both become more noticeable.
If I was to buy another motorcycle tomorrow, I would definitely stick with the Triumph Sprint; it is engineered well, and designed to please the everyday rider.