I've still got my htd5 personally I like the looks of it.
Mine is a 2017 and had it from new and apart from a teething issue at new has been pretty much faultless.
Issues wise had a new valve block when new as one side didn't like tracking without the other lever having input and it had a couple of accelerator cables.
The only breakdown it has had, was from a burst pipe but that's due to a mixture of poor design or having the pipe in the wrong position on the factory floor ( right track motor pipe sat tight to edge of frame and eventually rubbed through)
Other than the squeaky roller (which has stopped for now) it's just had oil and filters and has been the most reliable bit of kit I have bought so far.
Tipping height is decent and it's very rare that the skip doesn't fully discharge the only thing that lets it down is poor tracking power for turning and the too speed isn't exactly rapid but it's still on the original tracks with well over 50% and has shifted thousands of tonnes
I also have an old ex hire 2008 cormidi 6.50 diesel, in my ownership it's had a starter motor, battery and regulator (2 if you count the cheap one I have sat on the shelf that i didn't end up butchering in and got the correct part instead) no idea if that's the end of my charging woes as its just sat for the time being. Also needs two front rollers that no one seems to stock or even list. Good points it's rapid, if anything too fast, first gear is similar to the htd5 top gear and fast is decent in a straight like but mental if trying to do little turns. Bad points doesn't quite tip as high as the htd5 but worse unless the material is loose stone it's rare it fully discharges, hydraulic lift power isn't great either but could just be down to abused ex hire machine
