I have a slightly earlier model (D250) which has a slightly less powerful / slightly more power hungry processor (was £189 from ebuyer back in Feb 2010). Largely the same otherwise.
Overall it works fine.
The WiFi is not quite as good as my laptop. It connects fine, just the signal strength is not as good.
One thing to watch out for is the OS. Mine is WinXP (which is what I wanted). Some are still on sale with WinXP, but unless you have a particular reasons for wanting WinXP, I'd suggest getting one with Win7.
Note that, like all netbooks, it doesn't have an onboard CD/ DVD drive.
Touchpad does not have a scroll cum centre click wheel, instead these functions can be achieved, after a fashion, via the tap functions of the touchpad. Unfortunately this requires having the tap to click function enabled which means that the slightest touch of the pad clicks an item even when you do not want to. My solution to this is to use a mini optical wireless USB mouse instead.
Other main criticism is the plethora of bloated software that Acer pre-install.
The 1024 x 600 screen has its limitations. The windows of some apps don't size down to 600 high or less, which can be a pain (common to most, if not all, netbooks).
Otherwise, I can't compare it with any other netbook, but it does the job for me.