Hobby Kit - NFT 250

http://www.growell.co.uk/p/1538/Hobby-Kit-NFT-250.html

I'm thinking of buying this NFT system but I'm totally new to this so I need your advise. How many plants can I grow in this kit? how many g's will I get?
Is the kit good quality? Do I need additional nutriments? Im confused between this kit and the PC grow room pro..

Cheers