This seems like a good deal to me....
Basically buy an o2 PAYG broadband usb dongle - its the newest version that has the memory stick built in, for £29.35 (reduced from £49.99) and you get a dongle that gives you 1 day usage for £2 through to a month at £15 for 3gb - this in itself if ok but not a great deal but the main thing here is that it gives you free access to over 6000 hotspots in the UK.
And you dont even need to top up to get the hotspots, so basically you could spend £29.35 buying the stick and make use of free hotspots for life. Then if you are in an area with no hotspot coverage you just pay £2 for 24 hours of surfing.
The hotspot usage does not count towards your download allowance so you can surf away for free.
I know other providers who charge £10 a month for hotspot usage alone, so this seems like a good deal to me. The Cloud itself charges £6.99 to £9.99 a month.