Interesting thread,I've not owned a trials bike for over 20 years but bought a 4RT a few months back for training(I race a GSXR1000) and I think it would be by far the best bike for 95% of riders.
It's simply quality for a start do the routine maintenance and forget about it,most of the other makes seem to be nailed together in Spain in the vain hope they might last a week without snapping in two.
Some of the basic engineering and quality is shockingly bad,I reckon I could weld a frame better than GasGas can and I've never used a welder before.
The suspension is top notch,they've enough power for most people and they hold their value which is enough reason for me to buy one.