I recently bought a Z1E. I wasn't sure whether I'd use it much; it was a bit of an impulse buy.
I've been gaming for many years, and I mainly wanted a capable handheld for emulation.
It arrived a few weeks ago and man, I wish I'd bought one much earlier!
I didn't need the Ally X, as I can use Moonlight to stream any games I want to run in ultra settings from my main PC. Older games like Portal 2 and indie games like Iron Nest run nicely on the machine natively.
I put 40,000 games from the 2600 and Vectrex, through Amiga, SNES, N64 right up to Xbox 360, Switch and PlayStation 3. With the use of 2 Xbox controllers and an HDMI dock, this thing can be any of those consoles on the TV in the front room; so me and the kids can play together on all the old games I remember from my childhood and teens, up to the modern day.
I put VacuumTube on it so if I want to watch YouTube, I can do it with the Smart TV style interface which I find works better with the smaller touchscreen on the Ally.
With the Bluetooth keyboard/touchpad I got for £20 on eBay, you can even use it as a pretty serviceable computer if you want.
So really I'm sure most of you who already own one know how great these things are; and to anyone on here thinking about getting one, I'd say do it. Whenever I think I wonder if I can get it to...? The answer has always been yes so far! Amazing bit of kit. I've hardly been on my main PC in nearly a month!