What's the difference between Ariens and Gravely products? Is there a difference between the quality of materials, design, or manufacturing? For example, is there a significant difference between an Areins zoom 50 and a Gravely zt50? I've been running the heck out of my new Gravely zt 34 since the beginning of the season. The only problem I've had so far was that the wire harness connected to the pto switch worked itself loose. Other than that I have no complaints about it's quality. I want to upgrade to a 50" deck next season (with limited funds), and it seems like a no brainer to get the Ariens if there is basically no difference between the machines. By difference I'm talking quality, design, etc... not warranties and such. Thanks in advance for any comments.