I'm considering the JRB and the Speer tarps as an upgrade to my HH ULBA. The trade-offs seem to be the lighter weight and simpler set-up of the JRB versus the bigger coverage and versatility (for use as a regular tarp) of the Speer. Can experienced users of these tarps comment on: coverage in heavy, wind-blown rain re: protection of underquilts; and their reasons for choosing one over the other? Thanks.