My 40 year old preamp in my Ovation 1618 12 string had gone bad. I found the original Ovation replacement part to be ridiculous expensive. The MicroPre in combination with a stacked potentiometer is a very cost effective alternative, provided you are not scared using a soldering iron.
Installation: instructions are available online. For me a huge plus, cause it allows you to assess it pre-purchase. Diagrams are well documented and showing different installation options (volume only, volume + tone control). If you know how to solder, you can install it. Only downside is that the instructions don not include the tech specs for the volume/tone potentiometers and tone capacitor. Based on the pots sold by Schatten seperately I figured out that both volume and tone pot need to be 500K Ohm log versions. The tone capacitor needs to be 47nF.
Sound: Sounds good to me for live playing. I could not notice a significant difference between the original one and this one.