A couple of weeks ago I tried the Biofinity Contact Lenses. They
definitely hadn't been fully launched when I bought mine, as the test
lenses still came in boxes labeled SiH48 instead of the brand name.
In my opinion they are certainly more comfortable than B&L Purevision,
Cibavision Airoptix/O2Optix or Focus Night & Day. I think they have a
lower modulus and that's why. However they don't reach the level of
comfort I experience with the Acuvue Oasys lenses.
They are a little easier to insert than the Oasys ones, however they
lack both a visibility tint as well as an inversion indicator (features
that I've come to appreciate

). I also think that they don't have UV
protection.
In addition to this, the optical zone must be relatively small as it
gives me a lot more halos/starbursts than the Oasys lens. Probably this
won't be an issue for most people (Or most people are not aware of
optical zone problems? Two eyecare professionals I've been to actually
were not aware of this either).
As far as I know, the Biofinity lenses are currently only available with
a BC of 8.6.
Andi