The only time I have a problem seeing what I'm doing is if I'm digging something deep, let's say 3' or more. Then, the QA plate tends to block my view of the bucket.
Note one tradeoff that I see with the angled dipper, like Rivco used. I'm not sure that he can lay the bucket flat on the ground like you can with a straight boom. My friend and I have found this useful in two ways:
1. He's cleaned out the fencerows on his property that has a barbed wire fence by sliding the bucket through underneath the bottom wire -- then curling it to pull out bushes, briars, etc.
2. The most power the minihoe seems to have is the "breakout force" of the bucket curl. You can dig or pull something with much more force by laying the bucket flat and curling it, than you can by putting the bucket on it and using reverse on the PT to pull backwards -- or by using the PT's lift-arm bucket curl to pull it (the leverage on the lift arms that far out in front is weaker than the curl cylinder of the minihoe itself). I'm not sure this communicates too well, but that's what we've experienced...
Regardless of straight or angled dipper stick, there will be a "blind spot" somewhere, where the QA plate obscures your view. You can lift (or lower) the arms of the PT and get around this, but like I tried to describe above, the PT lift arms don't give you the "breakout force" of the bucket curl on the minihoe itself...