Kyrill,
Yes, the GK-1 is complete and has been playing for about a month. It should be well broken in by now and well-stabilized.
In addition, I have the TLP-N in my bedroom system (and the Foreplay is currently sitting on a shelf in the basement). So, I am in a good position to do some A/B/C listening on these preamps. I have not directly compared the TLP and Foreplay since I wrote the post you quoted, but I remember that the impressions were very clear, so--for now--I will stand by those comments. I can also say that the GK-1R really kicks butt, it is a very, very fine preamp.
My brother will be visiting in a month and I will try to do some listening with him. He is a recovering audiophile... has Classe amp and preamp, KEF 105/3 floorstanders; he loves his system and has no interest in making any changes. He loves music and audio, but is unconcerned and unimpressed with audiofoolery. So, we will get some CDs and a couple of bottles of nice wine and spend the evening listening. I'll write my notes fully aware of which preamp I'm listening to, while my brother will only know he's listening to preamp A, B, or C. I'll do some level measurement ahead of time to get the levels as close as possible. And, for sure, I'll post the results.
So, if all goes well, we listen in early November, report due shortly thereafter.
Peter