7900 is on my 'hit list",
Have to save my pennys for a 166 first, Got into saws 4 years back and got a PS5100.
That little bugger impressed me so much that I am a dyed in the wood Dolmar man now 15+ Dolmars (mostly Sachs Dolmars) and counting.
In fact the 5100 is the only saw I have not modded (ran too good to putz with it!)
I am sure the 7900 will be just as impressive.
Merry Christmas!