I got my disgo a couple of weeks ago now, but have been reserving judgement until I got the full picture.
In one sentence: this is a fantastic device.
I primarily got it as an ebook and pdf reader and it excels in both of these areas. There are numerous ebook apps out there, but the supplied iReader is fine for plain text and I have gone for Laputa for epub filles (which has links to an extensive online public domain library). I am using VuDroid to view pdf files (and it handles djvu files happily as well). With the device in landscape mode, I have no problem reading A4 sized pdfs. It is an absolute delight to use.
It handles most media files I have thrown at it (divx, xvid, mkv, mp3, wma ). The only type so far not accepted is FLAC. No biggie.
To point out some of the slightly negative sides, yes, the battery does not last as long as the one on, say, the galaxy tab. But when I find myself thinking things like that, I have to remind myself of the extreme price difference. For something this well-priced, I can forgive a lot of minor flaws.
It doesn't have access to the android market, but it does come installed with a third-party alternative, the SlideMe market. To be honest, this is fine, and you will find most of the apps you will ever need there, as well as some highly addictive games. You are, however, able to download apk (android installer) files from any source and install these manually. I have found the Google Code site to be an excellent resource for this (and this is where I got Vu Droid from).
The screen is sometime a bit iffy and you do have to occasionally press perhaps too hard with the stylus. But hey, for the price, I really am not willing to complain.
It comes with a mini-USB to USB male and mini-usb to USB female adapters. I have been able to add several different peripherals to the device using the USB host port, including a USB flash drive (2GB), a 250 GB FAT32 formatted desktop hard drive and even a mouse and keyboard. The last two would be invaluable if you were ever thinking of using the device for extensive text entry/word processing, which I believe is entirely possible (with the right app installed, that is).
A 2.5mm to 3.5mm converter and mini-HDMI to HDMI cable had to be bought separately (couple of quid each from play) and both have enabled me to make full use of all of the available interfaces. Using a decent pair of headphones, the sound produced is pretty good (although I don't think it's going to impress any of you audiophiles out there). Output to a telly using the HDMI port is fine, though once a file is playing, there is no control over it and the user does not have the ability to pause a file part way through. I can imagine this getting a little annoying in the long run.
The wifi connection seems to be pretty solid and has no trouble finding the networks both at home and in the office, remembering passwords for networks, and automatically connecting when the wifi is turned on and the network is in range. The included browsers seem to deal with websites fine and the included SkyFire browser has Flash support. Huzzah.
In summary, this is an excellent little device. It has its flaws, but don't we all? I have increasingly found it replacing my desktop for those little tasks: checking email, quick price checks, internet banking, you know the sort of thing. True, the battery life is not that great (I've struggled to get more than 2 hours constant web surfing out of it), but it depends on what you're doing (ebook reading, the battery has lasted well over 5 hours, with the screen brightness set way down low).
Buy one. Now.