Alright, in case anyone searches for this later on.
I ended up getting the Crown Urn because at the end of the day I wanted to give my hard earned to a home brew store and not some ****** from a hospitality supplies store.
When I first got it I did a test boil with water, I then did the modification where you bypass the boil-dry protection (posted elsewhere here and I can't recommend it to anyone unless they're electricians etc). I also got a really cheap camping mat. About $7. I took off the handles and took out the sightglass and cut the camping mat with a razor so that it fit around the urn perfectly, and used some old belts I had to secure the mat to the urn. I gave it another go and noticed that the urn constantly made a noise like it was working, where as before without bypassing the boil-dry it sort of cut in and out, even when it was only at 50 degrees or so with 20L of water in there. The boil dry protection seems badly designed to me and certainly isn't suitable for home brew application where you want the element to just be on when it should be.
So anyway, I did my first batch with it today and I must say this thing boils way better than my stove top could doing partials. I got a boil I was really happy with, anything more and I would think it was too vigorous if anything. Perfect boil IMO.
I uploaded a video to youtube if anyone wants to check out a video of it boiling.
note that I don't think the video was that great, it looks better in real life and especially without the hop sock in but it was an after thought to take a video.
Basically I couldn't be happier with this urn in its current state, it's the perfect BIAB single batch setup in my opinion. So easy.
I can also recommend the BIAB bags from gryphon brewing, and the hop sock from craftbrewer (http://www.craftbrewer.com/shop/details.asp?PID=946) as they are both perfectly matched to this urn.
Finally if you're are like I was, a partial stove top masher, I can highly recommend getting into all grain using BIAB and no chill. I found it a lot easier than stove top partials and in some ways even more than doing kits, although it obviously takes more time than kits.
I've also attached some pics to show how it went in case anyone is interested.
The urn complete with insulation and attached racking tube.
break material left at the bottom of the urn after racking.
cube containing wort. Used my knee to push it in to remove some of the dead space.
my old 19L Big W pot I used for partials comes in very handy to place the bag in and squeeze out excess wort, and then later on to put all your gear in as you no longer need it. Basically a nice stainless steel bucket that I recommend hanging on to to help with your brew day.