I have the Brushy Mountain version (no tray). At least I think it's similar.
I found it a quick and relatively inexpensive way to get a SBB on the hive. The only thing I can think of that might be a disadvantage is that, when using it, you turn the bottom board backwards, so, with a hive tilted forward, water will run to the "back" of the bottom board and have no where to go. I haven't found this to be a problem. Would just drill drain holes if it was.
Only had these on one season, so can not speak for durability.
If you are just starting out buying equipment, you should at least look at CountryRubes Combo bottom board: http://www.countryrubes.com/
“The keeping of bees is like the direction of sunbeams.” -Henry David Thoreau