I use HP rarely, but never a problem. Just had a good experience cleaning out my FF miles--basically got to 20300 miles and spent the 20k for a RT on Continental up to Canada. I ordered the tix on Monday for a Sat. flight--not a problem at all, no charge to expedite, seats were available (Memorial Day holiday wkend)!
I'll just now consolidate on NW any HP flying.
jl