I've used the Grillipot for about a year and half's worth of summer/fall camping before eventually ditching it. It's a novel concept and intelligently designed, save for some shortcomings, namely:
It's heavier than it looks.
Rattles when stored.
Lacks stability in anything but a flat, solid surface.
Requires the charcoal bowl, which doesn't store as nicely as the grill tube.
Grill rods deform when not used in conjunction with said bowl (I placed mine in the fire pit before I bought the charcoal bowl).
Doesn't take well to a good size slab of meat.
A bit of a prima dona since you have to treat it gingerly and not bang it around.
After taking all this in consideration, I bought the Open Country Explorer Grid (
http://www.rei.com/product/401121). Made with heavier gauge SS, it has held up nicely and folds flat. Two are available at my local REI. One that's 12x6 inches and a larger one 23x12 inches. I have two of the smaller one which allows me to configure as necessary on the fire pit and stores compactly.
I did find one DIY'ed nicely. If you have to have one that stores like the Grillipot, check this out:
http://www.bplite.com/viewtopic.php?f=45&t=913