This is pretty much the same as the V8 minus the motor and battery. The v8 is more marketing than anything. it boast higher running time because the suction is reduced. If you run both at MAX with attachments it is exactly the same short time. plus the v8 models are over $350 (up to $600)
The v8 all have EPA filter. The V6 models are hit or miss, and this one have it.
It is only $30 under the average price, but it is often sold at $250.