I've wanted an alternative to those over-priced, cheap-assed, POS Holt blocks for years, I also used a pair of Harken blocks for awhile when one of my traveler blocks crapped out. I forget which ones I used (they just came out of my tool box), but I connected them together with some thin Spectra so the distance between the traveler and boom was the same as the Holts. They worked great, and I only replaced them when I got a new Holt block on "fire sale" discount at a local dealer. I'm not so concerned that the replacements be cheaper than the Holts (they can't be that much more - it's just two blocks after all). I agree 100% that there can be no gross performance improvement (ex. boom-height advantage). If we're going to the trouble of spec'ing new blocks, I'd also like to see boom-blocks that can be replaced without removing the eye-straps attached to the boom. That's one of the most PITA maintenance tasks on the Laser. It's way too much effort to replace one of the blocks on the boom - it shouldn't take more than a couple of minutes with simple hand-tools. Cheers, Geoff S.