I picked up a 4' blade this September, pics in my gallery. It is made in China, imported by a local company - happens to be across the street from the Kubota dealer. I think the list price was $300 Cdn
The blade I chose has 5 position tilt, which I don't use as much as I thought because the angle is too great. It has 3 position angle, then can be turned backwards for pushing, with another 3 positions. (left, right, centre)
We have only had one minor snowfall so far this year, so I have not given it a good workout. Pushing, (with the blade reversed) does not work as efficiently as I expected. There is a lot of free play in the 3 point mechanism, particularly with the tilt & angle adjustment, so the blade does not stay where you expect. As mentioned, it does tend to steer the tractor, and controlling the turns when you want does take some practice. I was running out of daylight, so I switched to 'forward' and put up with driving over the snow and pulling it out of the way, then cleaning up with the loader. Forward or reverse, the angle of the blade was about right, and the path is still wider than the B7001. As I recall, the grey marker 7001 is almost the same as the 7100. I also have the manual transmission on mine.
Now that I have bought the blade and paved the driveway, I am ready for a record snowfall like last year. This means we won't get any more snow this year. Joys of living on the 'wet coast'.