Tray loaders might hold up *slightly* better because they don't run quite as hot, but they still blow their flyback transformers at a depressing rate.
Fortunately, I haven't experienced that problem with either my tray-loading Bondi iMac, or my Graphite. Not to say that it won't happen sometime in the future, but I can give some praise to the robustness of the power supply, and analogue boards in these CRT iMacs. They've held up pretty well in both my iMacs.
I know the slot-loaders have problems with their plastic cracking but the tray-loaders are not immune to that either.
From what I have seen, the plastics used in the tray-loading iMacs were better constructed than the plastics used in the later slot-loading iMacs. The casing of my Graphite, for instance, is literally deteriorating because of this design flaw (although let's face it - thermal expansion caused by poor ventilation is really the culprit here), while these case-cracks are hardly noticeable (if not present) in the tray-loaders I have seen in labs, and so on. It could be hit, and miss with the tray-loaders, but definitely the slot-loaders suffer more, and it does show.
