That is a pretty interesting design. I own both seatpost mount-trailers (Burley Travoy) and own(ed) axle-mount trailers (Carry Freedom City, BOB, Burley Nomad, Bike Friday, and Wike). I have used Bikes@Work and CycleTote with the brake option.
The seatpost mount in my experience provides the best handling. By attaching at the seatpost, elastomer-coupled trailers are less likely to porpoise. In general, the spherical bearing-coupled trailers felt better (B@W and CycleTote), but the CycleTote felt better under load. The Burley Travoy, even with a load, is almost sports-car like in its nimbleness and ability to corner at speed. I believe the reason for this is that the moment arm of the trailer connects close to the CoG of the bike. Stability feels increased both at speed and while crawling. At speeds less than 3 MPH, the advantage goes to the axle-mounts.