I've had substantial success with the 80 lb thrust autopilot saltwater Minn-Kota mounted on the front. I also earlier mounted an 80-lb thrust above the 90-hp Honda anti-ventilation plate on the stern. This was OK, but wouldn't point into much wind or tide very well. The main advantage of the rear mount was you didn't have to deploy it. It was always there when the motor was down. In hindsite, if I had it to do over, I'd get the autodeploy and cut the front rail so it could swing to stow. Crawling onto the front to deploy and stow isn't too bad, but when I'm older it may be.
Overall, I've had pretty good luck with the front motor. If there are large waves that rock the CD22 and bring the motor out of the water you probably will use your main motor anyway. It hasn't been as much of a problem as I thought it might be. Make sure and get the autopilot and "anchor" mode. I can just hit the anchor mode and stay right on the same spot and pointing upwind or up tide if there is slight to moderate wind or tide. No wind, no tide it kind of wanders a bit so you don't stay pointing in the same direction all the time. Great for eating lunch, or mooching for salmon or trout.
I can also get close to dock (that I have previously approached and saved the course), select the course into dock and it will take me right there while I wait outside the cabin with a line or hook. Not suggested with high wind or tide. Also, people get nervous when they don't see anyone at the cabin helm, so you might need to do some explaining. Usually, holding the remote so it is visible and looking like you are doing something with it reduces comments. I can move forward, backward, move the bow either way, and spin in a circle if I want.
One problem is that I have the bow motor mounted to the port side of the bow so I can use my anchor, which comes straight off the bow. This means I dock on the starboard side, otherwise, the bow motor might hit the dock. If I need to dock on the port side, I stow and don't use the bow motor.
It is absolutely fantastic to troll for salmon in salt or trout in lakes. I can go 1/2 mph if not too much wind or tide. Can't do that with the rear-mount one, only downwind or downtide. I need to use a bucket or sea anchor to go that slow with the main.
That about sums it up.