the one you link to, I think) instead of a corded one, and I wish I had a "proper" one instead.
Admittedly, this may be slightly colored by the fact that the battery pack in mine died on the charger after a few weeks, but I rewired it to use a model-train transformer instead, which IMHO is a marked improvement; it has excellent speed control and weighs a lot less, and the wires aren't a big deal for me.
The problem with it, in my opinion, is that it seems terribly underpowered (and it did on the batteries, too). It starts bogging down on just about any load, and is quite easy to stall -- and that's with just very small burrs; I haven't even tried using a cutoff wheel in it.
Nonetheless, for very light loads, it's pretty useful; I build plastic scale model cars, and it's great for most of what I need for that.
I'm not sure if the "50% more power" that the one you linked to advertises would be enough to make it not feel underpowered or not. It will certainly be less powerful than a corded one, but may still be powerful enough for what you want, particularly as a second tool rather than your only one.
- Brooks