Digital BW, The Print

As the result of recent experiences, I am curious if anyone uses the 
ProPhotoRGB colorspace in photoshop when correcting/printing photos.

I had some photos I wanted to correct into B&W, and someone suggested 
trying the prophotoRGB instead of my usual adobeRGB. The expanded 
space was of course beautiful and seemed to capture subtle highlights 
much better (at least on the histogram: I only have an 8-bit monitor 
so I'm sure I'm not seeing everything). 

I went to print on my Epson 2400 with UT3D inkset, and found that 
much of my nuances and subtleties were completely lost on the printed 
output (using museo sr paper). I expected some of this, since the 
printer is a much lower resolution device. 

It took some effort to essentialy compress the colorspace into 
something the printer could better output, and at the end of it I 
thought I would have been better off just sticking with AdobeRGB 
colorspace, which is already smaller and has a shorter path to get to 
printed output.

musings include:

- do folks use prophotoRGB colorspace in general?
- If so, how do you think about/manage output to lower res devices?
- If it creates more headaches than not, is it even worth considering 
for bw desktop output?