The Boulder 866 is a great SS integrated. I owned one for 3 years and totally enjoyed it. If you are into SS amplifiers the Boulder 866 is tough to beat at it's price point.
However, I did sell my 866 about 6 months ago because I missed the sound of tubes in my system. Having a tube amp for over 40 years I felt something was missing in my enjoyment with the Boulder.
I thought I would totally regret selling the 866 but my new tube integrated sounds glorious and cost half the price. Buy a used 866 if you are concerned about keeping it .