I only know a couple performers that use the Fishman Solo Amp system, and both sold them after a week or use. To my aging ears they tended to sound a bit distorted, particularly at moderately high levels, and they lacked the crisp highs and excellent lows provided by the Bose L1 and L1 Compact.
I personally never seem to have a problem dialing in the mid range sounds with the L1 or L1 Compact, but maybe this has something to do with the venue configurations where I perform. With the standard L1 those frequencies were set with both the Remote and the system presets. With the Compact, however, all settings are made at the keyboard, which took a few days to set up, but now that all the EQs have been saved to system memory slots, they can be instantly recalled and locked in place for the entire performance. If changes are warranted during the performance it's just a couple button pushes to select another set of EQs and the problem's solved.
You'll find a lot of this information on the Bose forum.
Good Luck,
Gary