I bought a Sumvision Cyclone Astro from ebuyer last month. Its one of many brandings for the same device, momo9 and Scroll Excel are the same apparently.
£85 gets you
Android 4/ICS
7″ capacitive multi-touch display
1.2Ghz chip, 8Gb Memory
Mini HDMi out
Other stuff. iPlayer compatible.
The sound is pretty good (i.e. it goes plenty loud enough) good battery life, however the screen resolution is merely average (480*something) apparently the same as a smaller smartphone like the Desire, its fine for browsing but probably won’t blow your socks off, and the camera is appalling, its really only suitable for Skype etc. I find the browser is a little laggy but its fine if you are not trying to rush, I’ve not really bothered trying other browsers yet.
The spec is constantly being upgraded so it may be improved again now.
The only issues I am finding with the tablet (presumably all Android tablets in general) is its annoying that you can’t get widgets (such as BBC news) to fill a whole page, (seeing as you have a home screen plus four others to swipe through) and I find you have to be more positive to scroll webpages/slide between home screens. I’m assuming this is because on a smartphone screen, a quick flick with your thumb results in sliding across 50% of the screen, a flick across a tablets 7″ screen probably covers less than 25% and it isn’t enough to swap pages etc. I have to deliberately draw my finger across the screen.