Seatpost Mount Canyon Speedmax CF 7 Disc SP0048 Garmin Varia 300/500 series

It worked reasonably well at first, but after just over a year of normal use it completely fell apart. The performance was acceptable while it lasted, but the overall build quality is definitely questionable. I expected much better durability.

The Garmin holder (insert) is broken after 1x insertion - Otherwise very good quality

Great mount fit perfect.

Perfect fit. It's early days but on initial impressions it seem like a very good quality product.