They are phenomenal drivers and great people. I got started in Karting because of them.
I would recommend 100cc if you are starting out and go from there, it really forces you to learn the fundamentals and dynamics of driving karts. (Great cost benefits will definitely keep one in the sport long term). But they carry 125cc too.
1657 N Glassell AveOrange, Ca 92867
Customer support and service is waaaayy above and beyond what you would expect from any store let alone a karting store in so cal.