I have had the pleasure of working with Simon on a number of projects over almost 20 years, and in various relative capacities - as client/supplier, as co-workers, and as venture partners.
The recurring theme is that Simon is a very consistent, extremely reliable principal and manager, who has developed his passion for 'building the right thing' into the Product Leadership that he's known for today.
As a manager, he is understanding and inspirational - the sort of person you simply want to work for and go the extra mile with. As a co-worker and partner he is tireless, hard-working, conscientious and someone who always acts with integrity.
As a Product leader he is ambitious yet realistic, and amazingly creative. It's the latter that I personally admire the most, as over the years he keeps surprising me with new and unexpected approaches to process design, focal area discovery, user interaction etc. And so far he's always been spot on.
I can't recommend Simon enough