Sliding glass doors for Varanids?

[Pirarucu]

What is everyone's experience with them? I know drop down doors such as Wayne's are being used more often, but I have one of those on my burm's cage, and frankly I am less than pleased with it. I like how with sliding doors, you can adjust how much of the cage is open.
If you had a group of monitors, perhaps two or three.. It seems like it would be a hassle keeping them all in. My burm at least doesn't come flying out expecting food..

The only drawbacks I can think of is that there would be a small air leak between the two panels, and dirt could get in the tracks.
If you were to put up a barrier, you could prevent the latter to some extent. Or just use a shop vac whenever dirt got in.

So, from those who have used them, yea or nay?