The shortcoming of the Britax B-Smart is in our opinion the seat unit per se!
The foot is viiiiel too short! At the tender age of 1 year were hanging down the legs of my child. You dangle around, he does not come back to the footrest still long.
In addition, the seating position is not well thought. The Po was something deeper may disappear in the car, so that the child does not permanently slips into the strap between the legs. On vacation, dressed only in body, the inner thigh of the child was completely sore !!!
There also is no "stop" are in the footrest, it is hardly possible to use a foot muff. The legs dangle then stop in the bag down.
Too bad that the seat unit has been designed so stupid - with a great footrest and a comfortable total seating position would get the Britax B-Smart 100% the full 5 stars