These are overpriced, made mostly of plastic, and don't feel like a very high quality item.
I've bought three of these, and they have the same problem — the boutique will not snap into place when closed, no matter how hard I press down. I always have to pick it up and squeeze the middle of the underside to get it to actually click into place. For some reason this problem doesn't occur with any of the boutiques that include a matching dock (TR-08, TR-09, and TB-03) — only the ones where you have to buy the DK-01 separately.
Otherwise they work fine. As long as I make sure they click down when closed, pressing the button in the back reliably pops up the low and high stands. Without the dock they aren't nearly as nice to use, so if you aren't going to use the K-25M keyboard, and you can live with paying more it they should cost, I recommend this anyway.