I bought 2 of these so far, the commercial version for myself and the pink one (Hetty) for my mother.
The difference between the commercial version is that you can leave it on high or low and it always starts on the setting that you left it on last whereas the other versions always start on low. Also if you look at the base of the commercial version it has a slightly wider wheel base for stability and a curved skirt so it can be dragged around corners and doorways etc without falling over or getting caught. It also has a 2.5m longer cord
The commercial one also comes with stainless steel tubes and a Numatic A1 accessory kit (I don't recall if the pink one did)
They use hepaflo bags to catch dust and other particles, thats the same material used for bags that are used for asbestos removal. With a little looking around you can get genuine Numatic hepaflo bags for around $30 for 20 (about $1.50ea) delivered from UK eBay stores.
These vacuums have been around since the 80s in the UK where they are very popular, often cleaners and janitors will use them for 8+ hours a day for over 10 years without missing a beat. And the vacuums are also fully user serviceable which means if the brushes or cord winder wears out you can buy a replacement and easily fix it yourself for very cheap. Numatic still have spare parts for the original models and claim that they will always sell spares for every model indefinitely.
One thing to note is that you will need a UK to AU power adaptor, I bought a HPM plug end and put it on myself but if you don't know what you are doing then just use a adaptor.
These are sold at Godfreys for $469 and often seen on ebay for $350-500.
http://www.godfreys.com.au/henry
I am very pleased with mine and its the strongest vacuum I have ever used, the same for the one I bought for my mother. I am very tempted to buy another for myself but I can not see the point in having 2 in my apartment.
Also delivery is free (may be 0.99GBP) and its amazing that they can send them over here for so little. It took about 9 days from ordering to delivery from memory.
I bought one in December and one in January (found on OzB) when they were 99GBP and they have been sold out ever since until the last few days, I assume they will sell very fast again. There may be a voucher to lower the price (10 off 100+ or something) but its still a steal at this price as shipping alone would usually be the dealbreaker.
$179 using google exchange rates, the price may vary from different credit card issuers and PayPal.
Commercial - Red
http://www.thehut.com/household-appliances/numatic-1200w-com…
Hetty - Pink
http://www.thehut.com/household-appliances/1200w-hetty-vacuu…
Henry - Yellow
http://www.thehut.com/household-cleaning/numatic-1200w-henry…
Usually I wouldn't write so much for a deal on here but I believe these are truly unbeatable for the price.
Link to the previous deal from late last year from Zabby (same dealer as The Hut):
http://www.ozbargain.com.au/node/86678
He's a sucker.