What if any is the difference in the hull design; what I mean is the bottom of the hull?

Other than less frills, cheaper model, looks better, narrower beam & cost more there are no design differences?

Catt, I think we need to go over to the Skeeter dealer and crawl underneath these two and check the models out side by side. I couldn't seem to find anything in their literature or on the Skeeter site that got into the subject of actual hull design. Here's a little comparison on the specs of each from the site. ZX is listed first. 180 Series: Length both 17.8, beam 89/88, draft 14/12, weight 1500/1270, max hp 150/130. The next model is the 190: Length both 18.5, beam 92/90, draft 15/12, weight 1500/1390, max hp 175/150. There certainly is a price difference between the models. Great question. Keep us posted with what you find out. My goal is to trade up to a ZX 190 someday. It sure is fun using the "build my Skeeter" interactive part of the Skeeter website. Hell, I bet I've done 50 different versions over the past few years.

Tough to say looking at the pictures on the website.  Besides the wider beam on the ZX it looks like the Z might have a slighter deeper V than th SX. Tough to call though with the pictures they have of each boat.

If I am not mistaken the ZX hull was redesigned last year and is very close to the I class hull design. I have a ZX195 and I just love it.

On the ZX hull redesign.  It was mostly cosmeticly redesigned.  The Hulls were very similiar between the Iclass and the ZX to begin with.  The Iclass being 1" deeper (1" is found right below the rubrail for the most part) and about 100lbs heavier to give it a better ride.

On the ZX vs. the SX, I am not quiet as sure about this but I do know that the main difference is the splashwell (ZX doesn't have one and the SX does).  If I were to take an educated guess at it, I would say that the SX has an older hull design that might be lacking in the Chines and Strakes.  I have driven both and can tell you that the ZX handles a whole lot better than the SX in turns.  JMHO