I decided to return my medium black Gabrielle, but bought the samorga insert (size M1) beforehand. Just wanted to share my thoughts for those of you thinking of getting an insert:
1. Shipping: It took forever to get to me (ships from Korea).
2. Quality: It seems really well made. Very solid. I bought it in black and I think that's the best color because it's less noticeable when you open the bag.
3. Space / fit: I didn't take pictures with the insert inside the Gabrielle but I didn't think it took up too much space at all and I could have still fit everything I wanted to fit into the Gabrielle.
4. Verdict: My SA said that my Gabrielle (medium in black) will definitely slouch over time without an insert and I like the look of the Gabrielle a bit more upright, so I would definitely want an insert and I can't imagine one much better than this. So I say go for it!
Now what to do with this insert when I don't have a Gabrielle