Ricochet, No, I have no pics, do not recall the "finish", but as a modestly priced unit I do not expect to be overawed by its aesthetics or find it is a peak of engineering excellence, the proof is in the pudding, IE: does it do what it is supposed to? So far yes it does.
Yes I did read your findings with the Engine 27, and do not doubt your findings, glad it is the good deal you hoped.
Our experiences with the Silvretta are not scientifically analysed by any means, and we may have different expectations that are not easy to define in words, but it just goes to that no matter what a review etc says, our findings will always be empirical.
Going back to your observation of the poor finish of the Silvretta, I may lift it and replace it so I can have a look, if it is a poor finish ( as it probably will be!) I will lap it............I am familiar with lapping technique from my woodworking shop, Plane blades, chisels, machine parts etc, so out with the plate glass and granite block and the cutting pastes!
If I do lift it I will get some pics up, before and after lapping and respective performance in each state.
Edit: I just noticed on your build specs........Noctua NF-S12B redux 1200 PWM Case Fan (120 mm x 25 mm) placed under the lid right over the CPU/MB Hmmmm.. This assistance thus enables BIOS silent mode on the E27.So not a strict assessment of the E27 "as is" but as part of a cooling system.
I also see you note a low machine like hum even then....... granted, as a complete cooling system it works, but the E27 is not in too demanding a position as if it were the sole CPU cooler.