Fed, I have had extensive experience with Rowland Capri. It bested my ARC REF 3 in harmonic development, control of treble intermodulation in complex passages (think of multipart violins), bass control, and general authority and transients. Staging and imaging were comparable between the two devices. The only aspect of Capri that I thought might have benefitted from improvement was the lowest octave in the bass that could sound slightly blanched compared to REF3.
Note that a new Capri will take approximately 700 hours of operation before stabilizing and giving you its best. Like M102, it is perfectly safe to leave it on all the time, because power consumption is negligible, in spite of it operating in class-A.
You can significantly enhance the performance of your M102 by powering it through a Rowland PC-1 rectifier.
Technically, you can also connect PC-1 to both M-102 and Capri through a "Y" cord.... But I do not recommend it. PC-1 is great for M-102, M-201, M-501, and COntinuum 250, but makes the sound of Capri slightly pinched and throaty.
There is a significant amount of information on all these devices, and how they interact, on the Rowland knowledge base:
All manuals, including Capri and M102:
http://jeffrowlandgroup.com/kb/categories.php?categoryid=14
Capri FAQ (25 articles):
http://jeffrowlandgroup.com/kb/categories.php?categoryid=8
M102 FAQ (25 articles:
http://jeffrowlandgroup.com/kb/categories.php?categoryid=7
PC-1 FAQ :
http://jeffrowlandgroup.com/kb/categories.php?categoryid=23
Best, Guido