Really like my 350s. Way quieter than Hope. Roll fine and though I opened up mine after a few years and thinking it would need servicing, the bearings still looked brand new and the grease looked new!
The caps are a bit of a pain to get off (need a vice), but I think that’s why the bearings last so long.
Can’t see the bearings being any different to the 240s really. Maybe more fancy brand but to me bearings are bearings. It’s the hub seals that are important. That’s why my old Crank Brothers are swiss cheese (and also makes me wonder what the big deal is about Hope when people rave about how easy it is to change the bearings… but you’re having to change the bearings! DT, they keep on going).
The 240s are lighter but a lot more expensive. 350s are fine for my needs and can still build up relatively light wheels with them.
Oh and the ratchet design is lovely. Much prefer them to pawls, plus you can swap the ratchet for faster engagement version if you want (apparently slightly less durable though).