We have permanent DST in Argentina. We are in UTC-3, but we should be in UTC-4. It gives you more light in the afternoon. It's so good, that sometimes we apply DST^2 and get to UTC-2. (Note that the last time we applied DST^2 was in 2008 or 2009. But we may decide to apply it again.)

The problem is that once you are used to a permanent DST you change many of the schedules because there is plenty of light in the afternoon. Midnight is a prime TV time here! So DST^2 starts to look like a good idea.