WL 3/4 Length 15 Degree Questions

[rweb82]

Hi All, I am in the market for my first "good" underquilt. What I have decided on is that I want a 3/4 length 15-20 degree UQ. What I have not yet decided is which vendor to go with (so many good options). I am leaning heavily towards WL or JRB. Both seem to be well-respected, and represent a great value, from what I can tell. I have three questions about the WL offering:

1) Does WL use water-resistant down?
2) How high is the loft on the 15 degree UQ? (WL advertises 2" but I know many cottage vendors surpass their advertised claims)
3) Can a secondary suspension be easily added to the quilt?

Thank you for any help!