I’ve dealt with Jason directly when he bought one of my Rolexes and I bought one of his Blancpains, and indirectly, when he negotiated the purchase of a vintage Submariner from an old friend of mine.
If I had to describe Jason in two words, I’d say he’s ‘knowledgeable’ and ‘straightforward’: he knows a LOT about watches and he doesn’t mess about when he’s buying and selling for his collection. This makes dealing with him both informative and uncomplicated. In the case of the vintage Submariner, my friend pulled out of the sale twice, but Jason took no offence, even though he’d been messed about, and said simply, “I know how the guy feels!”. So, would I recommend Jason? Yep!