I have about 20 computers, from 486's to Pentium III's, CYRIX, and AMD. Some of my machines are Pentium II's, such as my dual 300mhz database.
Recommend this product?
When you buy a CPU such as a Pentium II, you are going to pay more for it than for other CPU's out there. Comparable CPU's would be Celerons and AMD K6's. I would highly recommend saving your money and buying a Celeron or AMD K6 instead, just make sure that it has cache. Even better, get a Duron.
The Pentium II requires a custom motherboard slot which is widely available now, however, in general you will not notice any increase in performance or stability. That does not mean that it is not faster; if you sat at the computer and performed benchmarks you will find that the Pentium II is going to be a little faster than other CPU's of the same megahertz. However, you might end up paying 30% more for a processor that is only 5% faster.
What you should instead do is buy another brand (such as the Intel Celeron or AMD Duron) at a faster speed.