Gobble..I like my HH PI a lot. I have the 8 inch coil. I had the 11 inch but I found it hard to pin point. I like being able to get the smaller coil down into the hole.
For me, the smaller coil can be run at the highest frequency setting and still run super smooth. Very sensitive to smaller targets and lower conductive targets. I have not gone back to the 11 inch coil, but will probably purchase one for Summer hunting in the water. The smaller coil for me tells me more about the target in terms of size and sound. It goes plenty deep too.
I think the HH PI is one of the better PI's out there and has lots of power. Only problem is it does eat batteries, but that is due to power consumption and I can live with that.
I have used several other PI's in the past and for the price, power, ease of use, stabliity and weight, the HH PI is tops.. My Goldquest SS V2 is still my best PI, but it's not waterproof.
JC