I used the LMB pro-treatment, moisturizer and shine restore on my Treesje bags and had fabulous results. I have the kit that is made for Balenciaga's delicate leathers and I have had no problems using the products on any of my Treesje bags.
My Asher is so yummy and chewy after I applied the pre-treatment and silk moisturizer. It looks as gorgeous as always and did not change a thing about it other than now it's protected. I took her out in the rain the next day and the raindrops dried with no marks and if possible it's even softer now.
I would always be sure to test a small spot first but they have worked great for me. Barbara is happy to help over at lmb if you have questions about their products and which would work best for your bag. Also, they give a discount to pf members