I had the Titan. I wanted to keep a QWERTY phone after BlackBerry pulled out of the hardware market. It’s the opposite of the small form factor that you’re after, though I understand the Titan Pocket goes some way to addressing this.
It was… functional. The keyboard was good, and certainly robust. The battery lasted a day and a half of fair to heavy use, and it was sturdy enough to shrug off most bumps and grinds with the Unihertz gel case. It was also super affordable, even at it’s peak of interest.
Unfortunately, the camera was utter shit (even with decent third party apps like Opencamera), and a design quirk with the fingerprint sensor mounted on the home button meant that it was the on the most raised surface of the front of the phone, meaning that it took the brunt of scuffs or scrapes, so the sensor became less effective. Some of the included apps were a bit janky but certainly workable, and even though the screen was super pretty the aspect ratio did funky things with apps designed for standard portrait displays.
For the money, you can’t go wrong with Unihertz phones, just don’t expect them to be flagship quality, and be prepared to put up with some minor annoyances.
I enjoyed my 18 months with it overall. I jumped to the Samsung Galaxy Flip 3 when I ran out of QWERTY options.