There were two or three people in my work place who moved to Brighton. They have since left to work closer to home as the commute was incredibly tedious, so make of that what you will.

Apparently it was not so much the London to Brighton trip itself, but crossing London once arriving at Victoria or London Bridge. Plus, at least one of them lived a good 30 minutes walk from Brighton station (couldn't afford to live much closer), so that all added to the misery.