Wow! The result IS truly amazing. Anyone out there even thinking about it, stop thinking, just do it. I went the ACS route through Specsavers Hearing center (the Harley Street center quoted double the price - £25 per ear and a 3 week waiting list) and it was quick and painless. I had to wait the full 20 days for my moulds, but worth every second of the wait and every penny I paid. The sound is so much fuller and richer. It seems to fill your head and actually happen IN your head rather than being transported. I can honestly say it's the best I've ever heard from headphones of any kind.
It's a weird experience at first. The molds go so deep into your ears and the feeling is a little too "full", but you get used to it. Having to use an ear "lubricant" is strange but very necessary (as I found out once when I forgot to use it). So it's a very "involving" process but so rewarding. The drawback is you can't let people try it themselves - the molds are far too personal to even think of it.
This is where the PTH facility of the E530's is so good. If you're on a plane and you have to talk to a steward, you can't remove the molds easily and quickly - but the push of a button allows you to communicate easily without removing the earpieces.
I'm so thrilled with these. Get the 530's. Get the impressions and enjoy like you've never experienced before.