I have boots from both Baker and Seal-it. The Baker boots are better quality. However, I am trying the boots from Seal-it because they are so much cheaper. I can replace all 18 boots for about $ 100 from Seal-it - Whereas the Baker boots are over $ 350.00 for the 18.
Note - The Seal-it web site prices are for a package of 6 and after receiving the first package I decided to go up one size high than they recommend. For example I ordered RERS 5 for the 22MM rear Unibal joints. We will see how they hold up.