I just went to purchase a Honda 621 Snowblower because of all the positive information I have received about it and have found out it is discontinued. They are replacing it with a HS520. I was told the only difference is it is now 5HP not the 5.5HP that the 621 had. Does anyone know if this is the only difference? Do you think this will be powerful enough? I can tet the HS520 for $629.00 so it sounds like a good deal. I just hope it has enough power and is the quality of the 621.