As promised here is my review, I already left positive feedback in
JasonHan's profile.
First of all: The miners arrived exactly 1 week later (7 days, with Easter in between), but that was mostly because they were stuck at customs for 2 days until things got sorted out. Jason was always helpful in the process and provided me with updates when my tracking info was not showing anything new. Communication with Jason was always quick and painless, he is a nice guy to talk to.
The Giant miners are working nicely after playing around with the settings. One miner worked out of the box, the other one was not configured and I could not connect to it, it never got an IP address. Anyway, I just connected them both together and they work fine now. The only real annoyance is the incredible loud fans, which you can hear 2 rooms away. The new Baikal cube miner fans can be adjusted (40-50% works out good for me, stays at around 38 degrees), but the Giants have no such setting, so I guess I have to put some other fans on them to reduce the noise a bit. Another thing is: They are definitively used miners, which is fine by me, but Jason should mention this when selling them. You can clearly see on the left one the marks and the other one also does not look new, but they work fine.
I am now a happy miner and things are going well so far (switched from suprnova, which always reported way too little hashrate to MiningPoolHub.com, which has a fee of 0.9%, but works very good for me). And here is the picture of the 2 Giants arriving today from Jason: