The Spa at Essex is consistently wonderful -- I almost don't want to write the review because if too many ppl know about it then you really won't be able to get an appt.
In all seriousness, you've not met a better staff, a wide array of affordable services and a nice quiet place to relax.
Only issue: The quiet room is lovely (when it's quiet)...but sometimes, you can get clients who use it as an "outdoor cafe" complete with not so quiet conversations. (This happened once in the many times I've been there.)
Otherwise, I'd recommend it to everyone -- and after your day at the spa, hang out in the local town of Essex...it's so pleasant and right by the river.