Top positive review
Holds relatively well on Urethane series Powerblocks
July 17, 2013
I purchased these because I own the Powerblock U-90s, which only increase in 5lb increments after you exhaust the 2.5lb cylindrical "adder weights". They don't stick to the urethane series as well as they do the classic non-urethane PBs, but the 1.25lb platemates hold with more than enough strength to eliminate any fear whatsoever of them sliding/falling off. Do keep them clean (dust/dirt free) though, as any dust on the magnetic surface of the platemate will hinder the magnetism, and possibly promote "sliding".
The seller accidentally shipped me 4x2.5lb platemates rather than the 4x1.25lb weight mates I had originally ordered. These held nearly as well as the 1.25lb platemates and I was still confident that they'd hold under typical usage.
As a workaround, while waiting for the replacements, I attached 1x2.5lb platemate to the bottom support of each white powerblock handle. This is pure metal with no urethane coating and it locked on extremely well, despite not being the same width of the platemate. As long as you center the platemate on the support, the weight distribution should be okay for most exercises (though I can think of a few where the weight distribution would be affected). Had I thought of this beforehand, I probably would have ordered 2x2.5lb instead of 4x1.25lb.
After notifying the seller "Serious Steel" of the shipping error, they immediately shipped out the 4x1.5lb replacements along with a return label to ship the 4x2.5lb weight plates back. Great service.