obviously using spray, pins or basting by hand is a personal preference. And there is a huge difference between sprays, techinque for using the sprays, and the quality of supplies used in the quilt itself.
I only use 505 spray at this point, which is odorless, cleans easily with water (if necessary - i never have any need to clean anything because I don't have overspray), and I use 100% cotton in my quilts with quilters dream cotton batting. I think some of you who are complaining about shifting may want to think about what type of batting you were using. perhaps if you had a higher loft or poly bat, that may have been an issue. :?:
Anyone with respiratory issues would have to take the use of any product into consideration. For others, who have no adverse effects from the sprays, but suffer from arthritis or limited ability to physical work on basting a quilt using another method, the 505 is a life saver.
Happy Quilting! :-)
Lisa