The brake work and oil changes on the Boxster are some of the easiest I've ever done. At ~15K so far that's all that's been needed - and the brake work was only a bleeding/flush (with a removal of the pads just for fun 'cause I was there already
).
Getting to the engine is not bad, the biggest issue is removing the rear storage box if the car has one. Been in there several times for fun and to make sure the mice didn't do anything bad over the winter, less than 10 mins to access and replace it all once you've been through it to figure it out.