Hey! I have that!
I used to just use a glass jar with a cheesecloth and rubber band to strain, but when that one was on sale I figured, why not?
It isn't that it works any better, but I like it because it just more, efficient somehow. You pour the water in the top, it trickles down through the trays, really slowly, and collects in the bottom one. You could actually forget to dump the water, and it's still okay. I guess it does a better job because the water hydrates the seeds a better rate. Anyway, if you get in the habit ( I was!) you'll always have the right amount of fresh sprouts handy, because you can sprout different trays at intervals.
I do recommend.
I usually do alfafa, brocolli, and mung. The smaller take like four days, mung a week. I've never tried lentils.
Don't let the perfect be the enemy of the good