I've had one of these for a few months now.
I ran it for about 3 weeks without frogs in it, to get it set up, and then put two RETFs in it.
I have it permantly planted with three different plants/trees, and they're doing well in there.
Though I didn't do a drainage system using pebbles ( and went for just an orchid bark substrate to plant into ) I haven't had any root rot signs yet.
On the whole the terrarium is very good.
There's room underneath for a heatmat, but you'll need to get some polystyrene or something to put under the heatmat to keep it against the glass at the bottom.
You'll probably never take the top vent off, and you can build a box for a flurescent light like I did, to hide the glare, and it should fit quite well for a 15" or so.
The lip at the front is very good at keeping crickets in.
I've found the glass easy to clean.
The only problem I have ( and I don't see it can be avoided ) is that wires for waterfalls, foggers, and sensors for heatmats have to go down the back behind the polystyrene backing (Which, on a side note, is a very good back. The frogs love it).
This keeps the wires hidden perfectly, but the problem comes when you need to run a new wire down the back, and you have it already planted.
It's very difficult to pull the soil away from the gap at the bottom of the polystyrene where the wires come through, and actually get the wire down the grove and out the openning.
Took me about an hour when I had to do it for a new sensor for the heatmat thermostat.
Having said that, I don't think it could have been done any other way.
It's a great terrarium, in my opinion, and well worth the money.
Here's some photos of the terrarium planted, and the frogs in it:
http://www.kodetortoise.com/frogs/terrarium/
http://www.kodetortoise.com/frogs/050730/
http://www.kodetortoise.com/frogs/050731/
http://www.kodetortoise.com/frogs/others/
Hope this helps
G