I guess I'm a little late to this party, but I'll throw in my experience.
Boomhauer and I have had the same experience with Magnums. They are great right out of the box but do not last very long. On the contrary, every pair of Wellco or Altamas that the military gave me have been fantastic, and I have almost every kind imaginable (black, tan, sage, hot, temperate, cold weather).
In fact, I wore one particular pair of Wellcos through basic and Infantry school, and then three years of drill weekends (until we switched to ACUs), then I continued to wear them on my own hikes and as a security guard. They saw a lot of hard use, and finally died from a sole separation at the age of six.
Unfortunately, I gave away the rest of my black boots after the ACU switch so I had nothing with which to replace them. Luckily security forces at my base had decided to crack open some old foot lockers and found a bunch of brand new Bates, and a pair in my size. I haven't used them much on the job so far but they seem like they'll last a long time.
As far as Bellevilles, I have a spare pair of hot weather tan boots, but they don't fit quite as well as my Altamas so I never use them. I have no reason to believe they aren't as well made, however.