As a guy who pack's his 'dojo' around in the back of his mini-van I can appreciate those.
They really are the nicest thing I have used outside of actual tatami! Not the best for repetitive full judo throws, but good enough for aikido and BJJ for sure.
Based on my schedule and how I have to do things, my "dojo" has to be portable. Have mats....will travel! You can train BJJ comfortably with 4 persons. Aikido, well probably better with just two at a time.