As a ProDrive owner, I can give the pros and cons on that motor.
Pros -
Full Power Reverse (FPR). PD reverse is second to none. There isn't a motor on the market that can replicate that kind of reverse. The FPR pushes water under the boat and lifts up the rear-end and pushes you out. No fear of swamping if you dig too hard. PD is nicknamed the "4 wheel drive" motor for a reason. If you got yourself in there, you can get yourself out. That being said, you can still get yourself stuck and really stuck. Just like a truck, 4 wheel drive guarantees nothing. Use it to get out of trouble, not into trouble.
Easy to maintain. This can be said about all of the motors. They're just lawnmower engines. Don't look at them as a nitro-fueled dragster. It's just a lawnmower pushing a boat.
Cons -
The trim system sucks. It's hydraulic and will eventually leak somewhere. I wish their system was an electric actuator like all the others.
Vertical Block. This is easily the crappiest design flaw of the whole unit. The motor is mounted by the oil sump which is just asking for oil leaks. I currently have just under 100hrs on mine and I am going to be pulling the block apart soon to replace the sump gasket.
PD is on the slower side. Out of the box, I think the GatorTail is the fastest motor stock when compared with all the others. Not sure why this is, just what the general consensus is. If speeds aren't a big factor in your mind, then ignore this one.
Tiller Torque. With the vertical mounted motor, you have more torque at the tiller, especially if you do mods. Can't be avoided, but, with hours on the tiller you get used to it to the point you don't notice it.
The only downside to the reverse is, it isn't instant. That would be my only gripe about it.
These are just a few of my experiences. I'm far from an expert and hopefully some other people will chime in on what sucks with their motors.