Whats your take on the Archon 100 vs the 50 heads since you have both? Have thought about selling the MT 15 to help fund a 100 head. That extra bottom and headroom would be appealing if it responds like the Marshalls do between the 100 and the 50.
What you are talking on the MT 100 and it being a US flagship amp does make sense. Just wish they would have done a SE Archon 50 like they the guitars with the Core and the SE Tremonti guitars.
The Archon 100 will give you the typical things that 100's always have over 50's. Both sound great IMO but if I had to pick one I would always take the higher wattage in the huge majority of any amp for that matter....but that is me. If you are doing it to have both the 50 and 100 I don't know if you will get the differences you get between a MT-15 and any Archon sonically. I guess it comes down to money and what you want to do. In the perfect world, if I was going to only have 2 of the 3 I would go Archon 100 and MT-15.
I love PRS and have been with them for a long time. In all honesty, Paul is the master of the marketing, take away, flip, spin, rebrand, re-introduce, (you get my point here) of whatever he is selling. All that being said, there is definitely something going on with the amp line. I think he is trying to find a way to expand it without taking too much risk and jumping all in. The SE line (and all it entails - now amps, guitars, etc) is solid and doing well. Private Stock is doing very well. the middle ground is ok but the area I feel is least successful though it is successful. Spinning things the way he "appears" to be doing may give him the juice to expand the USA amp line and not have to rebrand what is already being made (Archon) so his base market stays in tact. Think McCarty....MC-58, Modern Eagle, ME II, etc...all McCarty's with some fluff somewhere in some cases and not in other cases but it made people buy guitars because of the take away. The Archon has positive market familiarity, value and recognition. That becomes the "SE" line and Tremonti has the weight and familiarity and marketability to bring the USA line and expand on it. I could see "Artist amps being USA and their variants being the SE line......or something like that. Just my own idea and rant here. Based on Paul's methods in the past, it makes sense to me.
Additionally, Paul is in the guitar business, not the amp business. He makes a great guitar personally. I don't think he makes amps on the same level.

Sewell has been involved and maybe they are looking to get paid so the lower price point/volume angle could be the way to go to help subsidize the future higher end line. Again, just my thoughts. It is interesting though. I do look forward to that MT-100.