There is another potential solution to the problem mentioned in that paragraph above: the DB7651A-24 (or among its siblings: the DB7651A 26 or DB7651A-28.) The numbers correspond to the clearing width, just as with all the routine DB7651 show. The A models differ in a couple of intriguing ways though.
Alloy vs Plastic Chute. The essential difference is the chute is alloy on these units. That removes the potential rock-damage problem. Correcting the skid shoes is great but even snow nicely over the earth can have embedded gravel. That will happen, for instance, should you drive on the snow before clearing it off the driveway.
Chute Deflector. The chute deflector height is adjustable, too, which affects the throw. To be able to vary the angle indicates the ability to set the snow in which you need. That's made even easier in this instance since there is an easy-to-operate handle on the A models. In the routine show you have to correct it by hand. Not demanding, but more difficult.
Distinct Tire Treads. The other difference between both string is harder to appraise. The An units' tires come having a slightly dissimilar tread pattern. How that affects real performance depends on a lot of factors. It's tough to create any sort of general statement. For some, it'll be a helpful development; for others it will make no difference at all.
Sorry to be this vague but, only to review a few factors... Almost no difference is made by the design in case your snow is often really dry. If it is hard packaged, the tread design will also have little effect. About the other hand, if you are grinding your way through wet, slushy, or arctic snow (or a mix of them), it can matter a great deal.
There are a couple of caveats to ponder when choosing the Power Smart DB7651 set snow blower from Amerisun, whichever model you investigate.
One is that, despite the American-sounding name, all these are produced in China.