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@colm
Ive been training on tb14's at an outdoor velodrome, very happy with them. perfectly round and no they dont flex, Im 18.5 stone and Id notice during sprints. being a 14mm high box rim it might show signs of flexing prebuilt but thats just the nature of the design, once spokes are brought up to correct tension they are plenty stiff.
Araya njs rims are lighter with similar low profile design and they flex more than tb14's, if you ever look at an ex keirin used hub youll notice the marks on the flanges from the spokes, they use very high tension to get the stiffness up which cause the spokes to cut into the metal.