Just done mine today, was a bit of a pig to get enough purchase on the Allen key bolts but did it as I need a new coolant water flange (plastic thing on the side of the head), so it made sense to do it all at the same time.
Pretty easy really, just I left the SAI pump in place as I don't fancy soldering anything not with my ham fists anyway. Still have an EML so I imagine I'll have to get it wiped by a mate, as I only have VCDS Lite.
It's a lot smoother now (not sure why) when idling, the cold start revs drop sooner (used to be 1 minute at least, now it's about 30 seconds), and it just 'feels' better. It's probably just all in my mind but needed to say it.
edit: forgot to say, if you leave the pump in place, remember to remove the electrical connector or your car will sound like a jet engine LOL.