So I own the 10.8" version of the above, same chipset just different size, with the keyboard.
There is a little bloatware but I found it reliable, updates regularly so is maintained. The 2-3 year life cost is dominated by the network costs so these phone chipsets can use regular phone SIMs, while tablets present as tablet chipsets and need to be a "data" SIM which cost and more restrictive. That sparked my interest.
The smartwatch is different if you're using as reactive device (to accept calls if you're away from your phone) then there exist low-cost PAYG incoming-free plans out there.
So yes reliable. It's an option that exists, different approach to a folding phone to get a larger screen and a lot less cost than $2000.
This is me with my larger version, traveling in UK via Ireland last month, remembering this is a fully capable phone, just large. It was roaming off T-Mobile USA SIM inside so had slow data.