I've dealt with Jon for a number of problems - as well as a computer purchase - and he has always dealt with me professionally and quickly; that his prices are very reasonable is a bonus!
He has always gone the extra mile for me and when you rely on your computer to earn a living, as I do, the quality of his service means the difference between letting my clients down or maintaining business as usual. Thanks to him I have never had to let a client down because my computer has broken (or, as is sometimes the case, I've done something silly to it and it is sulking...)
I would never consider going anywhere else for any Mac purchases, repairs, upgrades, or advice.
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