The thing that attracted me to this was the depth from front to rear. It fits comfortably behind a nest of tables or angled TV stand.
My tannoy front speakers have quite a good range and this just fills in the extreme low frequency sound effects on movies. I let low frequencies go to both front and subwoofer to avoid any discontinuity.
The sound is clear and strong. In the battle scenes of LoTR a whole new level of menace appears from this speaker that there was hardly a hint of before. I turn up the volume on it rather more than my amplifier's auto-setup would indicate, though. Strange, because the amp is Yamaha too, but it sets the subwoofer to inaudible levels by default.
Finally, I use a smart switch to power it on and off with the amplifier. This stops it using power when not in use and prevents any possible mains hum problems occurring.
Ideally I would have liked a cherry finish, but there was not much on offer in this category and nothing much as slender as these.
A good choice if space and/or budget are limited, and difficult to better.