Private blood test for cancer

Has anyone had the Trucheck blood tests that detects 70 cancers? It is available in the UK but is very expensive. I have been reading up on it and there is an article that says it can detect a cancer that it so small that it wouldn`t affect you for decades! Then there are other views which are positive, more so than for the only other test of this nature which is Galleri and is US based but trialling in UK.