I use a Poker and I find it extremely awesome. I'm really not fond of the HHKB layout for two reasons:
1. The Fn key is in a really bad place that forces you to move your hand away from the home resting positions in order to use it. The Poker's Fn buttons can be set to be on either side of the spacebar and you can press it with your thumb without even moving your hands. That lets you do everything on the second layer without leaving the home resting positions, including Delete which is on Fn+Z and Fn+/. On the HHKB you still have to reach for a separate delete key each time. Also I like the setup of the setup Fn layer on the Poker more in general.
2. I use Colemak so I normally replace my caps lock key with backspace which is generally a better replacement for it than control because you likely use backspace more often than control. Even if you don't use it more often, since backspace is used in the regular flow of typing, it is better to put it in an easy location. When using control to do things you usually have a bit of a pause. Also, consider that the alternative is having backspace all the way near the top right, which is either a very far pinky stretch or forces your hand away from the home resting positions. So in any case, I like caps lock as backspace and leaving control where it is, but on the HHKB I can't do that.