Actually they are rather good.. on a 48 inch tank you would want two of them. A lot of people use them on their 55-120g tanks with the most being on the 75-90-120's.
There is a person on nano reef selling 2 of these units right now.. and will take a reasonable offer..
Lets see.. 349.99 new, so I would offer 230 each unit plus shipping.
http://www.nano-reef.com/forums/inde...11&hl=Boostled
http://www.nano-reef.com/forums/inde...11&hl=Boostled