I use this box for about 7 years.
I am very happy: it is enough for a room of 30m ², probably a fair bit for more. Even for playing music, it gives me satisfaction. I installed 15cm from the wall and about 1m angle. Perfect for home theater, it main function!
I do not remember the purchase price, but it was a good promo, in 150 it seems. For the price I probably do it again the same choice.
Amplified subwoofer with 2 settings: cut-off level and low volume.
Attention, such as "all" boxes, the setting is ultra important, and depending on the source, even through a good amp (cd, dvd, blu-ray, tv) should board a sudden adjustment ...
I strongly advice to small and medium budgets.