5-months of operation and depths down to 100 ft. with great results, Olympus has always maintained great QC. I've been shooting amateur u/w photogs for 38-years, though most was with a Nikonos II with no leaks except for a light meter housing that was threaded, and I probably 'blew' that one myself. Keeping dry is really a matter of keeping the o-ring clear of hair, dirt, etc.
Even my last film SeaLife was really put to the test over just a three year period with 140 ft. depths, want to buy an old SeaLife reefmaster?
Grease or greaseless, control-buttons, just stay on them, wash/soak and operate all your control buttons afterwards. Quality-control at this level is a given, operator-error is expected!
You gotta love the Oly software>>>>>>>>>>