That sums it up pretty well. Since we are aware of the up side and I haven't seen much discussion of the down side, well:
1) Smaller to the point where the heat source is so close to the control knob that some people don't care for it.
Section hiker did an interesting review on the Olicamp version of this stove design.
2) The burner design is more wind sensitive than a pocket rocket or a JetBoil.
3) Although the BRS 3000T will boil water at about the same speed as the Pocket Rocket, it doesn't hold a candle the the speed of the newer JetBoil MiniMo, nor can you simmer over the BRS 3000T like you can very nicely with the MiniMo.
4) The BRS 3000T heats up an exceptionally small spot on the bottom of the pot, so doing anything other than heating water is either impossible, or requires crazy amounts of care.
5) From reading reviews, it appears that the quality control on the BRS 3000T is notably less consistent than the other stoves being talked about in this thread. Some people have had problems with pot supports collapsing when heating larger volumes of water with the the burner turned all the way up. Other people have not had the same disastrous pot support failures even with extensive use.
6) Also, with long-term use there is concern about thread life, given the stove's aluminum body instead of a brass body or an aluminum body with a brass insert.
All that being said, I like and use my BRS 3000T. I just accept that the design and quality have limitations that I am willing to live with when I use it.