Rode new snowmobile at event in ERX. The evaluation was compromised do to location on beat up track at ERX. I thought it was a good machine on a bad demo track. I grabbed a 6000 for comparison. With the bigger machine the bumps seemed a bit smaller but only in proportion to the small difference in the size of the machine. The short track ZR4000 took the bumps same as the long track LT4000. The machine does not feel like 3/4 size instead it feels more like 7/8 size. This is not a kids toy. It is a quality product. It was not bouncy like a old Polaris Indy Light. Fit and finish was great but just a bit spartan with regard to features. The engine was the star of the show. It was much quieter than the bigger 2-strokes and somehow smoother. It did not sound like a old one lunger. It was not quick to rev but pulled harder than expected at speed. The clutch did not engage as smooth as the Team clutch but it was close. My only complaint was how it tracked. It felt like it had little or no caster (trail in motorcycle terms). It took little effort to hold it in a turn but sometimes that steer force would go away or even go negative causing the machine to dart. Both the long track and the short track Blast 4000 machines behaved the same. The skis and rake angle looked the same as the 6000. On that test track the 6000 also darted but to a lesser degree. Go figure. It may have been just setup. Get this issue resolved and with a good windshield I think one could post a high mileage day on this machine.