In my long experience, there's virtually no difference between <span style="text-decoration: underline;">any</span> of the "No Loss of Suction" vacuums compared to Dyson. They may well have different names to distinguish each brand, but end of the day they're all Chinese made vacuums and all have similar hose measurements and motors. My Vax filters didn't require to be cleaned until after 6 or 7 months when used as a daily driver. After 2 years I eventually bought a new filter for it when a friend of mine was quite impressed with it - I eventually sold it to him.
The Vax has a pretty low 1200 watt motor as standard. The REACH model also has a 1.1 metre hose as standard but on top of that you get another 1.5 metres extension hose that stores on the machine. The bin capacity is 1.5 litres, so you're losing out a little cubic capacity over the AEG and Hoover.
However, the Vax is far easier to use and push than the Hoover Slalom that I bought to replace it. Had the REACH been available at £99 I wouldn't have bought the Slalom.
End of the day, I like a lightweight upright to push and not something that appears too bulky. Certainly if you want something as heavy as your Purepower, then go with the other models but to me, the Reach offers it all in terms of a cut price (now) upright that pretty much does what it says. If you want an upright with a long warranty, the Vax offers that as a sweet bonus.
Dyson Boy - do you actually own the AEG?? It doesn't appear to be listed in your collection on your profile on here.