The Acer's aren't fantastic, I'll give you that, but I've got the 24¨ version of the one you're showing and it's completely fine. Crap is harsh. Crap in comparison with a monitor costing half again probably, but it's easy on my eye now I've adjusted, and it's plenty quick enough.
As for worries about ordering online, if you buy from any decent company (and probably the smaller ones aswell) they have big departments devoted to sorting you out. If I recieve broken stuff I email or call them, explain the problem, they say send it back, I write a detailed note of the problem, stick it in the box, and usually recieve a replacement within a couple of days. I admit I prefer buying from shops as I can go in a shout at them until I get my way, but is it worth the usually much higher price?