In a later stint at NXWM fortunately I was at the only Garage that didn't operate Tridents, so I never had the pleasure. Hateful contraptions.
I have driven Tridents, and while some of them may have problems that nobody bothers to fix, they're some of my favorite buses to drive - especially the 04 plate ones we have, which feel like rocketships compared to most of the rest of the fleet. Shame it's rare that I get to drive them.
The Darts we had were something of a mixed bunch - I never experienced the V reg ones, as they were long gone when I started, but from what I've been told that's no bad thing.
Most of the Y reg ones, though, were still going until a couple of years ago, and were utter heaps with engines that weren't up to the job, making them painfully slow. There were two in particular I hated; 183 (Y183 CFS) and 185 (Y185 CFS), the first of which couldn't pull the skin off a rice pudding, which was combined with a rubbish gearbox with no kickdown. When faced with a hill (of which there are many in Edinburgh) you could build up a bit of speed before it if you were lucky, but you'd start to slow down as soon as there was a slight incline, and usually end up a little over 5mph, maybe as high as 10 if you were lucky.
I hated 185 because it had a throttle pedal which was either on or off, save for less than 1mm of travel where you could get it going at a constant speed, but when you managed to find that magic spot, after about 20-30 seconds the gearbox would get bored and kick down for no reason whatsoever, at which point your foot would move and you'd lose the spot you'd finally managed to find.
The 52 and 53 plate Darts, on the other hand, were fantastic little workhorses. They'd been pretty much run into the ground by the time they were withdrawn over the past year or so, so had plenty of niggling faults, but most of the time if they broke, either thumping the dashboard if it was a wiring fault or turning the bus off and on again would solve the problem. They were also powerful enough, a couple of them being proper little rockets that made getting out of stops on busy roads no problem.
To be honest, I do somewhat miss them now they've all been withdrawn and mostly sold on.