I received my Pyramid a couple of weeks ago, and I can say I'm pretty happy with the build quality, and I have used a Push 2, Rytm, Octatrack, OP-1, and various pedals. It's got a solid metal enclosure and feels sturdy / heavy enough (3.5 lbs) to use live. The knobs are plastic but what aren't these days... They have a knotched feel, but IMO that makes sense for what you're doing with them - it feels easier to be precise. When sending external CC, I noticed turning them quickly you get some acceleration. So you can still do broad tweaks pretty easily.
As for the cover on top - I wouldn't say it's plastic / cheap - it's more of an anti-stick / anti-glare that feels like the Push 2's touchstrip. At first glance, I wondered if it was supposed to be removed, thinking the labels would normally be printed right on the metal, but after using it (especially the touchpad) I actually like it. Your fingers never stick.
The touchpad: on top of the "feel" I mentioned previously, it also seems pretty high res, especially on the x-axis (since its a rectangle shape). Controlling parameters in Ableton via CC felt smooth and responsive. There's also a "touchpad relatch" setting that snaps the value back to zero (or any value you want), when you lift your finger off the pad. Good for momentary tweaks. Definitely happy there...
The power plug is a mini-usb port, and is about as secure as the Rytm's USB port. I found it also depends on the mini USB cable you use, because you have to supply your own. Only a mini USB power supply is included. You don't actually get any cables with it (MIDI, CV, USB). The USB plug does need another solution to keep it safe, like most gear these days. I usually have a long cable and tie it around something before plugging it into wherever.
I know I clearly sound like a fanboy, but this is just my experience. My criticisms would be that velocity-sensitivity is missed, but I'm not hung up about it, and would rather have no v-sensitivity than have it not implemented well (...rytm...). The buttons are stiff and tight in the enclosure. Not a huge deal for me since there's no velocity. You can actually rest your fingers on the buttons before pressing, which is kind of interesting. Feels very tactile - different from the ultra-sensitivity of the Push 2 buttons (which I LOVE as well).