HEYYY--I got quoted!! ;-{)}
OK, here's my experiences in addition to my post--I had a stick of Mushkin v1.5 installed with my cB0 P3 700, and the BEST I could do with is was 137MHz @ 3-3-3.
I installed the Mushkin v2.0, and after a few trials to determine what I COULD run, I was able to run it at 142MHz at 2-2-2 (which gives me 993MHz, and was for the most part stable; at times, there are a few "quirks", but for the most part it is rock stable at that speed--when I reduce the speed to 140MHz FSB & 2-2-2, all of the minor "quirks" disappear; this is the speed I now run at ALL the time).
This should easily illustrate the differences between the two, as far as what you can run them at, and at what CAS settings. NOTE--a stick of PC133 SDRAM has been found to be faster running 133MHz FSB @ CAS 2-2-2 than one running at 142MHz @ CAS 3-3-3, and since the price difference between the v1.5 & the v2.0 was $30, I should have purchased the v2.0 originally, or purchased a generic brand for less.
Even though I thoroughly am impressed with everything that Mushkin is (great tech support & customer service, prompt shipping that does NOT price-gouge, and probably the best packaging for SDRAM that I've seen), when it comes to buying the v1.5 SDRAM, I don't feel it is a good purchase if you plan to run more than 133FSB.
Why do I say this? Well, it WILL run CAS 2-2-2 at 133MHz FSB, but above that, it is an "iffy" proposition, so if all you are going to do is run it at that speed, and want the fasted SDRAM, there are probably other vendors out there that have sticks that will run CAS 2-2-2 as well, and are not as expensive, and they may even run CAS 2-2-2 at a HIGHER FSB speed; they certainly will run CAS 3-3-3 above 133MHz FSB, and at ~$40-$60 less than the Mushkin, they are far more cost-effective.
If you are looking at a GUARANTEED 133FSB @ CAS 2-2-2, and don't plan to go any higher, then this is the RAM for you. If you're something of a gambler, and want to see if you can get more than 133MHz FSB @ CAS 2-2-2, I would suggest a less expensive stick of RAM. If you want MORE than 133MHz FSB @ CAS 2-2-2, you will almost certainly need the v2.0 SDRAM (or some other vendor's equivalent).
I have used both, and know the limitations of the v1.5 compared to the 2.0. I am unable to run my v2.0 stick reliably past 142MHz FSB @ CAS 2-2-2, but that's probably due to the components I have, and not the RAM; however, I was only able to get a BEST of 137MHz FSB out of the v1.5, and THAT was at CAS 3-3-3, and that was with the very same components!!
Bottom line here is this--it's good RAM, but it's slightly overpriced for the performance above 133MHz(the v1.5, that is), when compared to the other vendors out there, including Kingston, PNY, and a bunch of generic brands--even at the $143.50/stick quoted. For an additional few dollars above that price, you get MUCH better RAM, or for a lot less (~$40-$60/stick), you can get some other vendor's RAM that will perform just as well; SO--it really isn't a good buy, unless all you want is 133MHz FSB @ CAS 2-2-2, and won't be trying to run it at 2-2-2 at any higher bus speeds.