I haven't posted much here but I have been playing this cabinet almost every day.  I've even had to deal with a couple arcade injuries...lol.  I was having irritation in my left hand and had to change the way I grip the joystick.  It took a bit to get used to but now I don't seem to have any issues.  I developed a muscle irritation in my left quad from standing too much so I finally ordered a stool.  And at one point I strained a shoulder muscle lifting weights and it made playing the arcade painful for a couple weeks.
I'm playing difficulty 5, 25K per man, 3 man start.  I've gotten over 100 waves about 5 times now.  My best game I did about 140 waves and hit 3.5 million.  Usually once I hit 100 waves I lose focus cause I start thinking about how long I want to play.  I still don't feel like I can marathon it because I'm not consistent enough.  I just seem to get into a nice zone every so often.  I usually get mad if I don't at least hit a million.  Yesterday I hit 950K and failed and got mad and played again and hit 2.2 mil around wave 80 but I was up against a deadline to leave the house so I got sloppy.
Anyways just checking in.  I usually jump on and read some posts but don't reply much.