I am loving it! Though I can't fully attest as to how it wears longterm as I just received it a few days ago. But, I have worn it all day, both showering and sleeping with it, every day since I received it with no issues.
I have also read often throughout posts that the Guilloche is extremely fragile & prone to cosmetic damage. The comments make is seem as though you have to be extremely mindful with it but in the handful of days that I have worn it I have not gotten that feeling at all. I have been wearing it while doing everyday household chores, etc. and the motifs look as shiny as the day I opened the box. I would imagine that if it was a fragile as many posts describe it to be I would have noticed scratches, etc. by now.
It probably shouldn't be an everyday, beat around bracelet but I definitely don't think that when you are wearing it that you need to treat it with kid gloves either. Just use common sense as you would with anything of value.
I hope this is helpful to you