You get the ability to self repair, various improvements in faster times to learn skills and reduced recharging needs. A good skill to learn is vampire-ism. The reason is that you level that skill faster than other skills and each skill level gets you about 80% of an enhancement level. Once you get the 100% enhancement stop learning the skill because it will be wasted. Go ahead and do the enhancement and go back to learning the skill.
For some reason the rapid enhancement stopped after I reached level 10 in vampire. The amount of increase seems to vary depending on the level of the skill and I haven't figured out why some skills and skill levels give a lot of enhancement and some don't. Leveling up a skill seems to be when the percentage of enhancement increases.
Vampire-ism is also an easy A in University because it levels up so quickly.