The "major" fear issue I had with the beam bike was the bounce I saw some triathletes have while riding it. Like bunnies hopping along in the field.
No bounce, and great handling (of course what do I have to compare it to?), so I will take one for a longer ride soon. The info I have gathered (i.e. Slowtwitch) so far is that it may be a good choice for IM and 1/2 IM events with regards to coming "fresh" off the bike.
** doesn't want to loose his legs for the run on the bike**