I just got one, tried it for the first time today, and second all that - referred here by a mutual friend and yes, I got the large size and suspect the small would have done fine, but it's not leaked.
I'm forgetful as well, so I ended up keeping tampax in my desk. I had four packets buried amongst the cables when I left. I didn't think I'd put them in that drawer, which my male minion had to dig through fairly regularly, poor thing.
I didn't trim it, it seemed quite keen to settle quite deep. Best part for me so far, having a weak bladder, is not having to either change it or put up with a wet string every time I have a pee, but yeah, changing it is fairly messy and will require the disabled/shop toilets while away from home. I suspect these things will get more popular in time, and as they do, the sinks in the ladies will slowly migrate inside the cubicles.