I like it, it does have a couple little quirks, however,...I like it.
Here's a recent LF response taken at the LP (12'), of a nearly 20 year old, heavily modded (not in a good way) Velodyne driver, in a small sealed box, powered by an EP4000;
12th octave smoothing, pink noise and sweep averaged @ LP
Now, the following is a comparo of the same sub, naked (no eq) nearfield, and the same signal at the LP, no EQ, to illustrate onset of PVG, ~ 23hz;
Obviously, the thin red trace was taken about an inch from the driver, minimizing room interaction. Also, in the LP trace, nothing changes other than mic placement, same driver signal voltage and conditions.