You have picked a knife, a good one by the way, so get it! It appeals to you for your own reasons. You can spend hours, days, listening and reading what people have to say.
Folks have opinions, experiences, preferences. Unless there is a real issue, those are just that.
Most common thing mentioned seems to be the inconsistency of the mechanism. You have a steel blade, running on bronze washers, sitting against steel liners. If tolerances are good, this isn't rocket science. Things can be adjusted if needed.
PM2 is my favorite of Spyderco knives. I have 6 different Spyderco models. Each excels in something specific. PM2 is my jack of all trades. Had three; down to two; ready to pickup a new one if they release it in Maxamet.
I bought it before I got involved in the forums, before I was aware of these perceived annoyances. I have no regrets.
And yes. The blue M390 probably has a typo in the etching. It says Earth, but it is out of this world.
