I used it that way for seven years (Europe, Japan) but it is so slow even for web browsing these days because of poor graphic acceleration capabilities. Moreover mobile connection is also issue, I had an obscure PCMCIA wireless card but it supported 2G only. These USB sticks have bad signal reception and are no longer compatible with Windows XP anyway.
My problem with any computer is that in our rural location, internet speeds are very slow anyway. Even using a more modern computer, one is not going to spend a lot of time watching videos or playing online games here. (Actually, just this afternoon we signed a petition of the inhabitants to protest our slow internet connections - it is that bad.)
So I have gotten used to minimal multimedia use (the constant insertion of Google-pushed animated ads on many websites does become more and more awkward though). Hence, the X31 does not feel especially slow. I still use a T42p as my daily machine as I do a lot of writing and prefer the keyboard and 4:3 screen (1400x1050), so the X31 compares decently with that as a travel laptop doing essentially the same stuff. And indeed, it is very sturdy.
As far as the wireless connectivity, mine has a good built-in wifi card and reception is usually excellent. I use no 2G or 3G mobile phone connection inside my laptop - again, there is no mobile data net availability here either, I have to use bare bones GSM just to make phone calls that are dropped half the time. When I am on the road and need to use the 3G phone network instead of wifi, I connect my smartphone to the 3G internet and then set it to act as a miniature wifi hotspot, so my X31 can get on the internet through the phone.
Basically, as long as one is happy to do mostly the things they did 5 years ago with a computer, the X31 is perfectly useable. Like discussing on boards such as this one....
Of course these machines did cost the equivalent of some 2000 euros when new, so in terms of build quality no modern netbook or affordable hybrid/convertable lightweight Win10 machine can compare with them...