I got to try out my Jullian en plein air umbrella today with all this beautiful sunlight. I used the umbrella with my Mabef field easel and it worked beautifully. It really made it easier to gauge my colors on my palette and on the painting. What I really like about it is that it's white so it doesn't completely block out the sun. It's also not too small nor too large. If you're a plein air painter, then I highly recommend that you pick one up.
I look forward to using it a lot more as our flowers grow and I paint all summer long.