Another plus is ability to scroll heal others. From maybe 600 heal scrolls I bought while levelling I used a lot in nice groups while splitting up for optionals or whatever. I took Skill focus UMD at 15 I think, max scroll mastery, 30 human amp. 50+ concentration, scrolls for 200 and Otiluke's hitting for 1.5k in Vale was overkill for survivability anyway unless I did something really, really stupid.