I've owned a Marsha with all of the options for a few months along with a Bogner XTC 20th Anniversary & CAA PT100 and after different cabs/spkrs, tubes & biasing, I like the PT100 the most. The Marsha definitely is a great thought out amp with some very nice tone and Dave does know his electronics, but for me the flexibility of the PT100 just kills! I don't mean turning a tone control here and there, all three amps have there relative comparison original specifications. I like John's original design of the PT100, but when you change some of the components, the PT100 goes from great to incredible, sweet to ferocious (The best Marshall meets Fender) I worked with all three amps, looking for the sweet spots (The Record Plant) with some incredible engineers, I also had access to some large rehearsal studios where the amps can be opened up and the XTC was the least impressive next to the Marsha & PT100! All three amps have there +/- and everyone has different taste but I look for response, definition, articulation, organic content and I wanted a great effects loop and the PT100 with the Solid State Loop is awesome! I think the Marsha sounds "Best" without an Effects-Loop! Just straight tubes and raw and the Marsha sounds beautiful! What really impresses me is that Dave (like John) will custom modify there own design to the customer, where as Reinhold Bogner will only repair his amp if something goes wrong? The Marsha is a fantastic amp but when I tweaked the PT100 it has the "Throaty" Growl of a killer Marshall, then to an absolutely beautiful sounding Fender