Hi John,
I see that no one has replied to your question so I thought I'd throw in my thoughts.
First, I have no experience at all with Mapletree Designs so I am not speaking from experience. I am only offering an opinion that to be honest is not based on much. So here goes.
How that amp sounds will depend on a large number of variables. The power supply, the output transformers, the circuit topology (and I have not experimented with that particular circuit as used by Mapletree), the quality of parts, the quality of the tubes, and on and on. It looks OK on paper. I would question why those particular tubes were selected. You don't often see a 6SL7 as a phase inverter for example. I happen to like 12BH7's or 6SN7's. But, it may sound just fine. Only your ears can tell. It would be very hard for anyone to praise or assail that design without actually hearing it. I don't think anyone can tell you how it will sound by just looking at the schematic.
A lot of this is subjective. An amp that sounds great to me or you might sound terrible to another person. Or the type of music you listen to might make a difference. Some speakers for example sound terrible on rock but great when playing jazz and vice versa. All I know is that the amps I've built using the circuit topologies Shannon has offered here do sound extremely good to me. I love my ST-70 clone built using his board. It is powerful and wonderfully clear. My eiclones are also very powerful, responsive and sound very, very good. They work great in my home theater setup and provide a lot of transient impact. Commenting on how the Mapletree amp would do with the movies and music I like to listen to would only be a shot in the dark without actually trying it. It would be nice if there were some impartial reviews available (maybe there are) or perhaps a try before you buy program or money back if you're not happy or something like that.
So, unfortunately, the only way I know to tell you how that amp sounds would be to listen to it. My opinion is that I could build a lot of amplifier from scratch for $1000.
Hope this helps but I doubt it did much.
Good luck with your decision. I wish I could offer more help.
With regards,