every quilt i make has different batting- the batting for that quilt- some poly (i love dream poly--but have used many different ones) cotton, wool, bamboo, dream orient (which is a silk blend)
poly batts are GREAT for utility quilts (quilts for kids- quilts that will take a beating- be washed alot---dragged around-used to make forts and have picnics)
it does not matter where you buy your batt---only you will know---unless you tell- quilt shops sell poly batts- the same as walmart.
as long as you follow the recommendations for quilting your quilt/batt will hold up as it's made to---so-if the batting says you need to quilt it every 4" make sure you do- if it says you can have up to 10" between quilting lines-it is really going to hold up-
poly batts are good for tied quilts too
they wash up nicely=wear like steel- don't shrink-
no reason to worry about it if that's what you've been using successfully no reason to think it's a bad thing-
only you know where you bought your fabric/batting/thread ect-
there will always be those people who will ohh and ahhh over your quilt- love some of the fabrics- ask where you got them---when you say walmart---suddenly they are sticking their noses in the air and have lots to say---well they liked it just fine a few minutes ago---
they had no idea until you told them...don't let negativity limit your creativity- use what you can afford-and works for you and don't worry about it.