A independent german hardware and software site was able to test the service in their Paris headquarters in April. The first impression was positive.
Link to the article in german (Use Google Translate): https://www.computerbase.de/2018-04/blade-shadow-cloud-gaming-pc/
Relevant section about latency, translated with Google Translate:
Interesting to note that the company just aquired a new datacenter in Amsterdam which (at least for German users AFAIK) reduces latency, acc. to the Shadow "to a significant degree". Their other datacenter is in Paris.
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The site also did a test of the BETA version of nVidia Geforce Now (still german): https://www.computerbase.de/2018-01/geforce-now-nvidias-spielestreaming-test/
Translated tl;dr:
Nvidia GeForce Now game streaming on the PC is now available as a beta for Windows. In the test surprise the low latency and the huge game selection. Only the picture quality stutters again and again. Curious: With the EVGA Precision X tool, the Tesla P40 can be tuned in the cloud.
I would consider myself a traditional PC gamer and I am certainly not in their main demographic. For me, building a PC is part of the Gaming experience because its so much fun. Nothing better than receiving package after package with new fancy hardware. Won't ever pay nobody to take that away. But hey, if it makes some peoples life easier. ¯\_(ツ)_/¯