I have that exact kit- the terms "as good as they get" is accurate. The basics are very right about this kit. However, you will have to tinker to get everything lined up and working right. If I were you, I would replace all the nuts and bolts with quality hardware store pieces (grade 5 is fine).
Once you get everything right- it works quite well. I have the Honda engine, but I have heard that the "tribute" engine (aka clone) is well made- but it is not rated at as high peak hp or for as high peak rpm.
There is information about eliminating the engine governor and building a throttle linkage when you get to that point.