I actually have 2 of these, but have not used them any more. Mostly because I learned from here that they are not any good.
I did like them when I did use them though, about 13 years ago maybe.
Issues with them
- Will leak if not carefull in setting up
- Yeast will not fall to the neck easily, carboy not steep enough. You can agitate to get the yeast to drop though. You will not get it all out though.
Also it turns out that leaving fermenting beer on the yeast for a month or so isn't as bad as once told, so most of the benefits are moot. I am now playing with 4 weeks in primary with no secondary. I have also pitched onto the yeast cake, so have reused the yeast this way, and will start washing my yeast soon. So a I am getting a lot of the benefits of the fermentap with out the worry of leaks. The stands do come in handy though to dry carboys.