I completed the 
Amy Butler Sophia Carry-All.  I think it's very cool, but it was a little frustrating to make, largely because of:
- The many layers of fabric / interfacing / fleece that were hard to sew through;
- The combo of the piping and the rounded shape:  either one would have been fine on it's own, but trying to sew the piping on while keeping the curve even is very hard; and
- Attaching the bottom to the sides -- three walls and piping all meeting together is just asking for bad things to happen.
 
There really are a lot of flaws on my bag, most of which you have to inspect closely to see, so they aren't showing up in the photos.  It was fun to make, and I am enjoying a feeling of accomplishment.  Although it's imperfect in many respects, I'm happy with the results.
About the pattern:
Overall I think the pattern was written pretty well and gave good details and accompanying diagrams.  However, I was very disappointed to find a couple of errors in the pattern.  When I paid $12 for the pattern (a substantial price, I think), I was paying for the creativity of the designer and the expertise of the pattern writer.  The errors in the pattern should have been caught by careful proof-reading, and I think the pattern producer had an obligation to do that.  I noticed the errors on my first read-through.
I did email the Amy Butler company about the errors, and they were responsive and sent me several free patterns (which I think was the right thing to do).  They have posted a 
correction of the most substantial error on their website -- BUT, the correction is not the right one, or at least not the most practical way to correct the error.*
Anyway, like I said, I like my bag a lot (although....not as much as I like 
this version).  I'm looking forward to using it in Spring / Summer, although I am kind of regretting choosing white fabric...it's going to be hard to remember never to set the bag down on the floor.  I added a bit of the exterior fabric to the inside as a trim at the top of the pockets to make the inside more interesting.  I love the fact that it has 4 pockets -- those will be very useful!
*The error in the pattern is that it calls for 1/8 yard of timtex ( 1/8 yd = 4.5 inches), then expects you to cut the bottom panel out, which is 5.5 inches wide.  The 
correction on the Amy Butler website says to get 1/4 yard of timtex instead.  You don't actually need 1/4 yard -- 1/8 yard is enough.  Since the 5.5 inch bottom panel includes 1 inch of seam allowance, you can subtract a little more than an inch from the width (and length) of the bottom panel timtex piece, so the 1/8 yard is wide enough.