Earlier this year Aust. Wood Review published my review of these.

Long story short, their flatness and the abrasive quality are big advantages for a chronic chisel and plane blade rehabber. And there are cost and convenience advantages over diamond and ceramic stones.

Caveats:

1. The WPs come with 15 micron PSA strips at the coarsest. 3M make coarse grades of their excellent PSA and plain sheet abrasives (down to 100 micron; various labels: Imperial Lapping film, Micro-finishing abrasive/film).

These have to be sourced in std sheet size from o/s (I've tried locally), and when cut on the long are 65mm shorter than the WP plate. But you do get a range of grits that make the setup a grinding and honing system; ideal for lapping backs in poor condition.

2. I don't know what adhesive 3M used for the WP supplied strip of 0.3 micron but it was a sod to remove the residue. Tried acetone, shellite and meths. Those turned the residue, which covered the whole strip area, into a sticky gum. Oddly the 15 and 5 strips left nothing behind when removed.

In any case, these abrasives continue to impress. Yesterday I got a polish on back and bevel quickly with an A2 Veritas blade, going from 15 micron to 9 and 1.

One issue that emerges with some of these grades of PSA sheets is even adhesion. The 9 micron in particular went down with air pockets that I couldn't smooth out. Web posters have suggested a spritz of water to deal with this, strange as it may seem, but it fits with my experience of adhesive film applied to my motorbike fairing for protection purposes.

And now as an aside, picking up on some comments in the thread on Stanley replacement blades: the question was raised 'how durable is the edge of a quality plane blade straight from the factory?'

My experience with this V. A2 and two Hock A2s suggests the answer is not very, and the only explanation I have is that the heat-treatment process leaves the edge weak. One of the Hocks got nicks quickly on first use, and the V. showed a whopping wear bevel after about 8 strokes on cranky redgum (used in a LA BU foreplane with a 50 degree 2ndary bevel ground on the new blade).

That blade had to be reground on the Tormek to get past the wear bevel. The ruler trick, tried before the Tormekking, using fresh 40 micron 3M, got nowhere near taking it out.