I use Hobbs Poly down quite frequently. It has great loft and really shows off quilting. I also like to double up with poly. On this quilt have a layer of hobbs poly down over a layer of bamboo and the results are wonderful. Like Trapunto only without all the work!
http://www.quiltingboard.com/picture...e-t184163.html
Edited to add, not all polys are the same. I have used Fairfield poly and it was ick. Uneven in thickness and very fragile. Hobbs is very nice poly and some of the quilters dream poly's are also very nice but very low loft, quilting up almost like W&N.