Here is what Discmania has to say about the MD1:
 
This is the MD1, our straightest Originals midrange - Reinvented.
The MD1 was the first ever Discmania mold back in 2006. We wanted to Reinvent the MD1 to be the golden standard for straight flying midrange. You can shape any line and trust the MD1 to hold it and arrive at the destination with its magnificent glide. 
Players will fall in love with the MD1 flat profile and beadless rim that feels comfortable and grippy in the beautiful C-line plastic.
The MD1 is a great choice for all skill levels and your go-to all around midrange to build your approach game.
Good for: Straight approach shots, Anhyzers, Hyzers, all skill levels.