Mahle forged 4.040 flat top pistons

How was your experience purchasing from them? Had never bought anything from them.
I've bought from them twice, both times everything went smoothly. The one time I ordered pistons from them via online. I got a phone call from them with an hr or so letting me know the .030 pistons were out of stock for I think it was 2 months at that time, but they had .040 pistons in stock so I got those instead. I've messaged them a few times about stuff and they are always quick to respond.