Here what I remember about NT 4.0 from around 1999-2000:
I used NT 4.0 on my shop server and also on my laptop and desktop units while with the feds. The desktop PC was a PIII and then a P4. I can't remember what was stuffed into to Gateway laptop. The software, other than the server, was primarily Motorola service software for programing handheld, mobile, base station, and repeater radios. On the investigative side, we used it to control dialed number recorders (DNRs) and other proprietary investigative software. Administrative use on the desktop saw PC Anywhere, Banyan Vines, and a Microsoft Office Suite. To be sure, NT was click-click and sure footed for our purposes. There was never any hitches other than some rare system hardware glitch or failure. We used H/P Post Script printers exclusively, as well as an H/P scanner, both of which were parallel interfaced to the desktop unit. Most of out PC's were Gateway and then there was a trend toward Dell. We were constantly provided with the latest hardware.
PC Hardware on NT 4.0 was a tricky area when installing drivers, especially if the home office sent a new video card to be installed. We had no or very limited IT back in those days, and if you couldn't crack into a PC case or know which end of the screwdriver to pickup, you were SOL.
Major software updates and/or mods were accomplished by jerking out the hard drive and FedExing it back to HQ. Sometimes you were directed to rebuild the drive on site. In that case you needed to have a little savvy concerning NT. If mem serves correct the primary max boot partition is no more than 4GB. However, if you're lucky, and have an image, then you could lay down a partition of about 8GB. After the primary partition it's the sky's the limit. The next step after you were up and running was to apply the SP's. We found that they needed to go sequentially from 1 to 6. Now, later versions of NT 4.0 had some SP's included.
The major failing with NT was no or limited USB support which was coming into vogue in the early 2K's. The only NT USB app that I knew of at the time was a mouse driver. Of course, there were those who attempted to hammer in USB where ever they could and then along came XP.
For our purposes, back in those days, it was a rock solid OS and got the job done, especially on the server. No major software glitches or gotchas. So, if you have an era Pentium or equivalent, give it a shot.