I have a CK2610 HST and haven't noticed any excess vibration. Seems very normal to me comparing to my neighbor's 15-20 year old Kubota (38 hp I believe) and my former JD 3320. My Kioti will out lift my neighbor's Kubota, but the JD outlifted both...but my JD outlifted both the Kubota and the Kioti...but the JD was bigger than my current Kioti and about the same size as my neighbor's Kubota. I am not sure of the Kubota model number...but can find out. They all make so many variants.
I was annoyed by the JD's steering hydraulic cylinder locations though...too low to the ground and bent the cylinder one it not once, but twice by bumping into hidden stumps over the years. I also had some front axle leaks on the JD.
My Kioti was selected on the basis of finding the most capable machine I could get (highest capacities) under the umbrella of the most reliable options available. I noticed all manufactures seem to have more issues with DPF and tier IV machines...so I looked for the strongest 25 hp tractor with a good reputation and Kioti won in my research. While I am no tractor expert, I did make a a few videos about my findings.
I now have 130 hours on it. I have done the scheduled maintenance...greasing, 50 hour service, checked loader mount bolts (actually removed them and added loctite and retorqued), etc...and have had no issues what so ever other than puncturing the fuel tank with the handle on a seed spreader that I borrowed that I didn't notice stuck so far out and forward I guess so the operator can reach it when it is lifted up without getting off the seat. Ordered a replacement tank without any issues and it was an easy install.
Very good machine and great price point. I would buy it again. I just wish they had more dealers.
P.S. Please excuse the dogs. I own a K9 and manage a business. The main reason for the tractor is to maintain our 9 acres of training areas.