This article is going to be about microwave drawers - describing them, what makes good microwave drawers good, the bad ones bad and just providing some user/"real" reviews of these things. Enjoy and benefit, please.
First of all, let's define what microwave drawers are. I had never heard of them, actually - and maybe you haven't, either. The name is very fitting for the product, as it's actually very reminiscent of a drawer. Instead of being a real microwave-oven, this is a "flat" version of that, that you put in above the regular oven - in most cases, I guess - and use it, there. This is obviously good because it saves space - because there's already "something" there, rather than with a microwave-oven, where you're using a part of your furniture. Are there other good things with this kind of product?
A great thing, at least it seems great, with this particular product http://www.nextag.com/Sharp-Pro-24-Microwave-646751196/prices-html is that it's supposed to be able to "feel" when your food is done, and when it isn't (those who use regular microwave-oven will know what I mean, when I say that you sometimes have to do a lot of guess; even when you have used it a while, because "every" food is different, when it comes to how long it needs to be microwaved).
Another good thing - which isn't as amazing, probably, but is still a cool function - is the touch-button that you open the thing with; making that action very easy and convenient. Sometimes, with microwave-ovens, it's not as capacious as you would like - meaning, some things you cannot cook/prepare in it. Is this the case with microwave drawers - too? Well, it might be, in cases, but in the one I linked to that's not the case as even something that is nine by thirteen inches will fit inside it.
A potential turn-off with the product in question is the pricing - being just under 700$ at lowest. That is hardly the least expensive one. 

But if space is a HUGE issue for you, and if you want power - this is able to plast out 1000-watts, and if you actually DO have the money needed, this might be a better option than others.

Hopefully you now know a little more about microwave drawers - so you can decide whether it would be a good investment for you, personally.