Hi,

I am torn between the Hepco & Becker and the Holan pannier rack.

The Holans look more sturdy (18mm steel tubes) but I've never heard of them.
Hepco & Becker is pretty well known however they use 16mm steel tubes.

Does anyone have experience with either of them?

Here are both the racks:
H&B
Holan

I will be using soft luggage on them (Adventure speck Magadan)