Bread-Bakers v117.n016.3

Does anyone have experience with a silicone bread baker?  I stumbled 
on one on amazon called "Lekue Silicone Bread Maker" that claims to 
keep the steam inside while baking, yet the sides are partially open.

I have a superstone cloche that I've used with good success for 
tartine style bread and I'm wondering if this would be a close second 
or a distant second in terms of results.  Any thoughts or experience 
are appreciated.  Thanks!