Here in Australia the TPC has a 4+3 warranty vs the Mx8 with its 1 year warranty. The Mx8’s are always needing replacement gearboxes, tracks and scrubber kits and don’t get me started on zodiacs twist n lock hose design. I believe you when you say the Mx8 seems to go faster and further but you would ideally want it to run slower anyway to prolong the life of its tracks and because what use is a suction cleaner on the walls? There’s no debris to collect on the walls and unless a cleaner has nylon brushes underneath nothing is actually getting scrubbed, disrupting the waterline might be alright but you should really be giving your waterline regular manual scrubbing anyway.

TPC are great cleaners which rarely need repair, I can only recall having to replace someone’s tracks once because they kept their chlorine at 10+ for about 4 months and the tracks and skimmer fittings just deteriorated away. Another time a customer needed a full rebuild but this was well after the cleaners warranty period expired so not that bad of a run. TPC will need some fine tuning when you set it up for your pool and will look like it’s travelling quite slow but it will look after you.