I’ve used one from a friend for about 2 hours. It wasn’t for me. I wouldn’t have paid $500 for the device, much less double. The added cost would buy a brand new K-Drill plus a milwaukee brushless drill and spare battery.
Give me an entry level FL-12 or a VX1 (if looking for bottom zoom) and I’ll match the success rate of anyone using a higher-end flasher over the same school of fish in less than 50′ of water.