I have had 100, 120 and 150 versions.
1x10, 1x12 and 1x15.
And a 1x12 extension.
The 1x12 150w with extension is still doing weekly gigs for an upright player in Glasgow.
The 1x10 is one of the best upright amps of all time.
The EV drivers in any version are worth £100-150.
The amp sections are beautifully built with craftsmanship far beyond the slap together ethic of Aquilar, Genz, SWR, Eden...
They have a healthy power stage and well made transformers, so have authority and poke.
Brilliant studio amp.
What's the head worth?
Nearest rival is probably a Mark V Trace AH150.
They pull £150-200 depending on condition.
Only Peterson thing I have now is a black tolex 1x15 combo cab that I loaded with a Celestion 500w neo and run with an SVT 3 Pro head on the shelf. Gig? Pull the head and away we go to big cab land. Yeah!