Love mine, but the first pair I had took ages to get right – I got through three sets of lenses to get them adjusted properly. But once they were right it was great, and have made a huge difference to me. Much, much better than swapping between two pairs all the time, although I’m with sturdylad in terms of using them with a computer – but I just take them off when I’m sitting at my desk.
When I replaced my first pair a couple of years ago I tried to save money by going for cheaper lenses, against the advice of my optician. It seems that in a triumph of marketing even greater than that of Shimano, the cheaper lenses have a narrower field of view, and the more you pay the wider the effective visual field. The optician let me upgrade for just the difference, and upgrade I did. I think they are Seiko; not sure, but they were the most expensive ones available.
I go to a decent independent optician. I guess I might pay around 20% more than I would at Specsavers, but I trust his judgement, I get excellent service, and he is completely unfazed by redoing my glasses until they are right. Perhaps I’d get that service anywhere, but I rather doubt it.
Start saving now though – they cost a fortune….