Quick update (Now 15, 2014)
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1:00 - night started a bit low, correction caught by the Libre about 15 mins before the Dex
4:00 - trending low, new correction caught by the Libre about 10-15 mins before the Dex
8:30 - calibration in perfectly stable conditions - Dex matches BG meter a bit better
9:30 - pre tennis carb loading - Libre catches rise 10 mins earlier than the Dex
10:00 to 11:00 tennis - Libre doesn't go as low as Dex and seems to be correct compared to symptoms/feelings. Catches up post-training rise 30 mins before Dex which seems to have trouble recovering from lows.
12:00 to 16:00 - lowish afternoon after intensely aerobic morning training.
17:00 - carb loading for evening tennis - caught by Libre about 20 mins before Dex. - 1U Novo to compensate for Lantus extinction.
18:00 to 19:30 - tennis, not as aerobic as first sessions, outside Lantus acting hours.
20:00 - Dex calib in stable conditions for both devices. Libre is spot on. Dex way off.
Just looking at the behavior in general at this point, no definite answer on accuracy (relative to BG meter) yet.
If you hit this post first, you might want to check the previous ones for the general context of the comparison.