Customer Rating: 
Summary: Best on the Market
Comment: If your looking for a way to keep your raised panel doors square during glue up, this is the answer. Using the Bessey clamps and the Rail and Stile Jig you can't go wrong. I have used the clamps and jig for over 5 yrs now, an I haven't found a time that it failed. This is a must for any shop!
Customer Rating:
Summary: Dad the Gift Giver
Comment: This item is just what the receiver wished. He was very happy with it.
Customer Rating: 
Summary: Could be better engineered
Comment: While I love my Bessey clamps, these blocks are less than impressive. The clamp falls below the block top creating an uneven surface for the glue up. The blocks should be made not to protrude above the clamp bar. That way the clamp bar provides a straight resting area for the wood to lay flat. I will try to remove the top quarter inch from the blocks to make them usable. Otherwise make your own.
Customer Rating:
Summary: Nice to have, but....
Comment: if you have time, you can make yourself a set of these with 4x4. These things are handy when you clamp things like frame, cabinet door or even small window frame like I did recently (I have 40" and 50" Bessey's). They hold the clamps level and square once set. But if you have a dado blade, you could make yourself a set of these with 2x2 or 4x4 blocks and save some money. It seems to me only one slot being used at a time, so you don't have to cut two parallel slots on the same block only two perpenticular ones, one deep one shallow.
Customer Rating:
Summary: Nice clamping aid
Comment: These blocks are a nice clamping aid. They make it easy to clamp in two directions at once with Bessey K-Body clamps. The only down side is that they are a little pricey. You can get them in a bundle with Bessey K-Body clamps here at Amazon, which is a good deal.
