New here, btw. hi, everyone!
I personally haven't used THAT preamp...but my experience is very detailed and lengthy with playing an acousticl loudly thru a P.A.
I play professionally for many years. In my experience, no Piezo captures an acoustic signal accurately. They tend to emphasize the high frequencies from 1k-10k....so tiny. "honky", plasticy..are adjectives that are often heard.
At similar cost..I would consider a contact microphone,instead. Like the ones used on telephones. Cheap, and once equalized ,more likely to sound authentic. But hey, all the technology is cheap..so experiement.
George