Had a chance to play with them in the store, I like them! first off more compact, both in use and storage. they compact together and fit nicely. Once you sanitize them the necks do not touch anything to become contaminated again, where with a tree the branches are touching the bottles. There is a separate drip tray so if you need to empty it you just move the bottle rack to the side and dump it, with a bottle tree when full of bottles you can not empty the drip tray. They come in two sizes, one for 750 ml bottles / 22 oz beer bottles. the other for 12 oz beer bottles.
the down side is cost, apples to apples to match the number of bottles each can hold the Fast rack is more expensive, but I think for the space saver it is worth the price. where were these a few years ago.
Now I need to get them on the web site....