I really enjoy Ken Schuman as a commentator, and I think he does an exceptional job. His technical knowledge of the game relative to rules, patterns, and game scenarios is excellent. He also does a great job recognising sponsors, introducing players, etc. My only qualm would be that occasionally he clears his throat into the mic. For that small transgression, I forgive him, and I will listen to him on a stream any day! IMO, he adds a lot of value to the production.
Mark Griffin is one of the most active industry leaders that the game of pool has today. He is undoubtedly doing more to promote and advance the game today than anyone in this country, and we should all be greatful for that. Personally, I enjoy hearing his industry and leadership perspective on things in the TAR pod casts, but not necessarily during a PPV, or at least not through the whole thing. A guest spot would be nice for him to field questions from the chat though.
With the above being said, Ken is exceptional by himself, and even better when paired with someone who can provide some "color." By "color" I mean, comedy, stories, current pool-scene rummors and info, etc. IMO, Justin should continue using Ken as the voice of TAR, and try out some new personalities to add more color commentary and current pool-scene information. There are a lot of well spoken pool players out there, and it's nice to hear from a variety of them as guest speakers.
IMO, rather than improvement in commentary, TAR could use an overhead (over-table) camera, a telestrator, and instant replay. I also like when the commentators can read and respond to chat participants during the stream.
TAR 29 was another great success for TAR, and they continue to provide a quality product.