Land & Sea still makes dynos for small engines.
Stan Hewitt offers an acceleration dyno for small engines.
Several of us use ones that were made years ago (Go Power used to build dynos. Henry Noonkester? offered the Prototype dyno, Jim Davenport offered one as well.)
There are literally hundreds of homemade hydraulic or acceleration dynos out there. Many choose to buy the parts and built it themselves.
Most are using Performance Trends software and data acquisition.
I wouldn't be real concerned with the brand as long as the information it provides is repeatable. My dynos are considered antique by today's standards, but I'd put them against anyone's as far as accuracy and repeatability anytime.
Thanks,
Brian Carlson
Carlson Racing Engines
www.CarlsonMotorsports.com
765-339-4407