I don't know how old this post is, but I would definately like to say I love this unit. I just got one about two weeks ago, transplanted three clones into it so far and they are doing great. This is definately not the cheapest way to go(I have two other 20 five gallon buckets with a recirculated drip systems), but man, if you have the cash it is definately a nice addition. The height thing is kinda a pain, but then again, I have a huge system with 5gallon buckets, so I am use to adjusting for it. I like how this system in contained, it makes things alot simpler. The crowding problem is only a issue if you are growing huge plants, but if that is the case, it is way better to build a custom system. The guy I got it from was growing and flowering in a short tent and getting decent yeilds, so it just depends on what you are trying to use it for. I plan on just using it for shorter autos, so there is no problems with crowding for me. All and all, I would definately give this system a 9 out of 10, GH definately has some great products.
K