Not really...I watched mine for quite a while without external correction, just with the colour and tint turned down a bit. Sure the ISF guys throw there hands up at such a suggestion, but for me it wasn't that
bad. I got the VideoEQ Pro at a good deal as part of the Beta testing group and it does make setting the gamma easier than using the rather fiddly custom gamma adjustment in the JVC's menu, which was worth it to me. The CMS is just gravy for me.
A useful tip to all new HD250 owners: The iris on this model has 3 presets, which can be changed in the user menu. By default these are set to minimum, middle and full. I found that the full option was far too bright for my setup (even now at over 500 hours I can't use it). What I did was go into the service menu (up, down, right, left enter very
quickly IIRC) and whichever iris preset is in use at the time can be editted in the service menu to any one of 16 steps (just like the dearer HD750/950 models can do in their user menus).
I used this to balance brightness for different setups such as when I used to zoom for 2.35:1 and zoom back to 16:9. I now have mine set at 15, 11 and 8 rather than 15, 8 and 0 which gives a smaller jump between the iris settings.
Hope this is useful, but don't adjust anything else in the SM (not that there is much apart from a 'lens reset' that you shouldn't fiddle with) and I take no responsibilty if you do.