For the first time I've broken my screen I've replaced in in a service for about €200. Next time I've dropped my iPhone touch screen started to work unstable and from time to time I've seen artefacts on a screen. So with this wonderful kit I've opened my phone in 5 minutes and figured out that it misses the bracket securing cables to the logic board, and 3 screws as well – they were stolen in a service.
For now I've just reconnected cables as is, going to ask for my stolen parts in a service or to order them on ebay...
At least – do not use unauthorised services in Russia.