When I bought the Depth i it satisfied all of my criteria, including the controls on the top. I developed postural vertigo, and couldn't bend over to adjust the rear knobs of other subs easily.
Its small size, and sound were other factors. I suggest you read the owners manual on the link I included earlier. It has some interesting features. The 25 Hz control knob has proven useful for my corner placement.
There are also several finish options.
Amazon is selling it.
http://www.amazon.com/MartinLogan-De.../ref=pd_cp_e_3
Blutarsky