I have finish up to cd 009 on last two tracks.
Giani Thakur Singh Ji's katha is easy to understand for everybody. Katha by Sant Giani Gurbachan Singh Ji Bhindrawalae is too deep. very hard for new listeners..... even Giani Thakur Singh Ji says in his katha.
I recommend everybody to start with Giani Thakur Singh ji kaths first Sukhmani Sahib then Japji Sahib and Asa di Vaar and after move to katha Sri Guru Granth Sahib Ji.