big foot + little foot

Hi,

Does anyone use these generic presser feet: The Big Foot for
freemotion quilting or The Little Foot for quarter inch seams?

I've done some research and read in the archives but the posts I read
were a bit old. How do they hold up in time? Any cracking? I read
one reviewer who said her Little Foot melted because her machine is
near a window and she lived in Georgia. How about the performance on
the Big Foot? Does it really make a difference? I spoke to an owner
of a quilt shop and one of her employees who said it wasn't worth it
and didn't see any improvement in freemotion quilting. They sell the
same kind of machine I have and probably used it on a Janome. Any
feedback is appreciated.

Thanks!

Renee