Ultrasound Amps - I have not played a gig or recorded a single song with an acoustic guitar in the last 10 years and not used either an ultrasound amp, or DI.  The amps are perfect for small and medium sized rooms and in my humble opinion the DIs are the best on the market.

CP100 - is my go to amp... mine has several hundred gigs on it and not an ounce of trouble.