Velodyne DPS12 was recently released, with similar specs, size, weight, and price vs the LFM1.
http://www.velodyne.com/velodyne/products/product.aspx?ID=9

The DPS12 has a 55 oz. (3.5 lbs) magnet, 25-120 Hz (+/- 3 dB), Class A/B 200W amplifier, and is Digitally Controlled with Front Touch-Panel Controls.

Having a cat I don't know if I would care to have the digital control panel on top (the cat might keep changing the settings to his preference), nor another electronic item in the subwoofer that could go bad, but it is interesting. In addition, the DPS12 has a 15 coat hand rubbed gloss coat that appears quite nice in the picture.

Nevertheless, I am leaning towards the LFM1, as it has a more powerful amp, very attractive finish, outstanding specs and reviews, and will just about fit in my allocated space, and probably pass wife muster! But I would like to know, not that it is a decision breaker, just how large the LFM1 driver magnet is. Anyone know?