I like my Ay-Ups, but if you're looking for zero faff, I can't see the Exposures being beat… not having a battery pack has to be a bonus right?
Generally, yep, but if you really do need a combination of bright light and extended burn times, you can argue that having a separate battery which you can replace is slightly more versatile.
If you an be arsed, the home-brew Cutter quad is bright as, plus you get a lot of flexibility in how you programme it to work.
That said, I'd probably go for exposure or maybe one of those Tiger lights which look excellent.