That depends on your level of expertise. They are definately good for getting you feet wet. (pardon the pun) . But, if you have grown hydro before and you know how they work basically, you can build your own for cheaper from parts from the big box stores. Really a matter of preference and how handy you are. Do you have a pre-made in mind? Maybe we can offer some testimonials (good and bad). Good luck.
its all a matter of how well you can build things. if you feel like you have the skill to build your own, then there is no reason to buy one because once you get it you'll just feel ripped off. i built my own for my first grow, but i build things for a living, so um...yeah.
Thanks guys... I have decided after much thought to follow Rumple's hydro/bubble set up. Props to him for building it so simple and explaining it in such an organized way. Tomorrow begins construction. Now I have to figure out feeding, nutes.. Keep your fingers crossed***
look under Rumpleforeskin here..He made his own bubble buckets and posted how to..There are other people who posted their homemade boxes, set-up's..Look in the forums