It's slow. and shifting though the available titles is a chore. I'm guessing you've never used it?
Le's say I'm flipping though the $2 titles on DSiWare. It loads the first two. Click, then it loads the next two. Click. Next two. Repeat until you find the title you want. Click like three or four times to confirm the download/purchase. Wait. Wait. Wait. Yay! Download successful. What? You want to download another game? Okay, go back into the $2 titles. Load the first two again. Already seen those? Tough. Click. Next two. Etc., etc.
Dear Nintendo, please give me a faster, cleaner way to select to purchase multiple products and download them at one time.
Of course, you probably shouldn't listen to me. I'm still boycotting WiiWare/DSiWare.