I have been using WMA for years to burn my CD collection to my computer and ultimately to my DAP which currently is a Cowon X7 and a zune HD....I use the highest bit rate and wonder how people think it compares to the highest bit rate MP3...I do wish I was able to use WMA on apple products but other than that I see no real difference...any thoughts?

I think this belongs in a different forum, but I'll give a quick answer anyway.
 
For low bit rates (below 128), WMA is tested a bit better than LAME MP3; however, WMA doesn't perform here as well as AAC nor Ogg Vorbis. At bitrates 128 and above, it is about the same as LAME MP3.
 
I personally never use WMA because of its poor support on the devices I use and its closed-source nature. In the past 5 years, LAME MP3 has increased in quality even more than it already had, beating or tieing most codecs in high bitrate ranges, and MP3 enjoys compatibility with literally any music-playing device sold in the past 15 years.
 
I use Ogg Vorbis to save space and retain high quality on my portable player, however.