In the course of searching around for vacuum info on the web, I ran across the Vax brand. It looked a lot like the Bosch upright, and sure enough, I found out that Bosch makes the Vax cleaners.

I was interested in various features, such as the integrated handle/attachment wand, the bottom emptying dust cup, the separate brush roll motor, and of course the cyclonic cleaning. However, although the various product descriptions described the unit as not losing suction, I couldn't find any technical information about the exact nature of the cyclonic system. It looked like just one big cyclone/dust cup to me.

I tried the VAX purple and it looks like an ok machine BUT, on the inside of the dust bin thier is a filter of some sort that probroly will clog. It is one big cyclone. And last, the powerbrush shounds like a whistle.

Andy.

Are we talking about the Vax AVC1 & 2 here? Because I used to have one of those! Just a single large cyclone drum with a filter inside, contained in a mesh - and yes, it did clog! Performance-wise, it was brilliant with a very clever edge-cleaning system that worked really well. The narrow cleaning head means the suction is intensified over a smaller area, so it cleans very efficiently. And the front-mounted removable wand was a great idea too - the thing that annoyed me about that was that the wand has bristles at the end - very short bristles, almost like stubble, and this is a poor substitute for a proper dusting brush / upholstery tool!
The motor was loud, and made the room hot very quickly!

All in all, I liked it, and I'd still buy another if I could find one cheaply...

Another pic:

And another!

Yes, that's the one.

Vax's may be available on-line, but when I searched for it I was only interested in reviews/opinions.

The filter-in-dust-cup is a turn-off for me. I have a bagless Eureka Whirlwind with the in-cup pleated filter, and it's just a big pain to clean. In fact I prefer the original Eureka Whilrwind with the dual cups, because the filters are easier to clean (just rinse and dry). The Reaction D2 is much easier to service, IMHO. Just a foam filter to rinse out every few sessions, and it seems to collect a lot less dust than the Eureka.