Concealed flush door frames inward opening

[Raks]

Hi;

I am considering to convert two of the doors to concealed-flush ones (inward opening) in the hallway of my house.

I have seen some ideas on the internet and a company called selo-uk (https://selo-uk.com/) which they do these kind of inward and outward concealed door sets but no pricing information on their website.

Looks nice in some places but I am not sure how reliable they are.

Whats your experience and and advice about concealed doors (especially inward opening ones) if you are using one or installed one.