These are jobs done by unprofessionals or cheap installers, which CGH has come across.
Picture 1, 3 and 5 have no pipe clips, pipes are not straight, no extra flux removed, loose wires making this a dangerous and unsafe site.
Picture 2 does not use jointing compound, which led to leaks.
Picture 4 shows sludge in the system due to improper power flush when boiler was installed. The customer changed diverter valve , flow switch, and installed magnaclean, so spent huge amounts of money on repairs, during warranty time.
You have seen the comparision between CGH work and others. The choice is yours.