Yes! Do it.... you will be happy. They are great little machines and they do sound much cooler than 2-strokes.

However, that being said, be aware that the fuel economy advantage is marginal at best - in fact I'd argue that my Saito is less efficient than an equivalent 2-stroke. (Yes, the mixtures and valves are properly adjusted) Also, while 4-strokes have a more pleasant sound than 2-strokes, they are not quieter in my opinion. I think the 4-stroke sound caries farther than that of 2-strokes. We get more complaints from neighbors with our 4-strokes than with 2-strokes.

I'll now put on my flame suit.