I believe Midwest also makes the rear blades for Corrhier Equipment, who is a sponsor and advertiser on TractorByNet.com.
I picked up their 5' model that also has the tilt feature and it is a great blade. The think I like the most is that you can make all the adjustments to the blade without tools, the Offset, Angle and Tilt settings are all adjustable with PINS instead of bolts, like on some other brands. Even with gloves on, you can adjust their blades.
I did find that if I am going to doing adjustments to the OFFSET feature in the field, I will spray a light oil lubricant onto the channel that the blade pins into to make it easier to slide the blade from side to side when making the adjustments.