I bought this as a low cost alternative to the very expensive Peli inserts or foam sets for my Pelican 1450 case. It has turned out to be quite a bargain.
It is the correct height and a good fit in length and width with a few millimetres to spare. Once loaded with equipment, it expands a little to a near perfect fit. Retaining the Peli foam lid, it does not move around in use.
There are more than enough padded dividers.
The velcro straps are a welcome addition and would be useful in an case without a close fitting lid, but they are not needed for use in my Peli - the lid foam is enough. I imagine they would come in useful if one were to use their thinner lid organizer.
Since the padded dividers take up less space than pick/pluck foam, I have reclaimed enough area for an extra lens.
Very happy with the product and Thomann's fast and efficient delivery to the UK.