APL 3910 owners, has anyone tried APL upsampler?

My wife and I apparently have only the second unit with the Upsampler. We've had the player for just a day--not much time, clearly--but thus far we prefer it with the Upsampler 'off' more than we do 'on'.

What we've noticed so far:
Upsampler ON:
The music sounds more blended
Softer edges between the instruments
Midrange feels slightly more airy

Upsampler OFF:
Better clarity
Images clearly focused
Distinct separation of instruments

I know that the choice between the two will be a personal one, and we could certainly feel differently as the player breaks in. Depends on the specific song as well as to whether or not we prefer one effect or the other. I will say that right out of the box, the player itself is ridiculously good. I know that's an odd way to put it, but those are the best words I can find for something that plays this well.

Hey Grant,
I believe that the Upsampler does eliminate the DAC capability of the player.
We are running our player direct. I've not heard the First Sound--only heard great things about them. At this point, I have no desire to add a preamp, as the music really sounds great.
I look forward to hearing your system, hopefully later this month.
Howard

Just got my APL 3910 with upsampler board and so far, out of the box I prefer the upsampler on. It gives the musical presentation more "presence" at this point - as the player breaks in, it will be interesting to see if and or how the differences sort themselves out.

Also, watched a DVD tonite and the upsampler makes a pretty big difference on the clarity of the voices - greater feeling of the characters being right there in the room with you.

Hope this helps.

It should be said that Fplanner2000 has the improved version of the upsampler. My comments are based on the previous version, which I'm having upgraded in a week or so.