Looks like Simplicity has updated the lighting and the chute-deflector control switch for the 2018-19 Signature Pro line. The line also has dual trigger steering. I'm not sure if the 2017's had the dual trigger or not. The chute control switch is a 3rd generation switch and looks like it should be very moisture resistant. http://www.simplicitymfg.com/na/en_us/product-catalog/snow-blowers/signature-pro-professional-duty.html If you are looking at heavy duty pro quality, non hydro machines, then put the Signature Pro's on your list.