Hi Shantiseema,
If you are getting your fingerprinting done for a PCC then the nightmare only begins with the SCRB...theres a long way to go after that...in my case I had a great experience at the SCRB (for the first time ever at a govt office for me) the person in-charge of the fingerprint dept was a gem of a man..dont remember his name though...he was the first govt official I met who was genuinely helpful and didnt act like I owed him money and was not returning it, he explained the whole process and also helped me with the further processes. In my case I had to get a PCC from kuwait since I lived there for 6 months and 2 weeks in 2003 (its a different painful story reg the PCC which I have posted elsewhere on this forum).
I dont know about private agencies such as JK, but in my opinion its always better to go with the govt agencies because otherwise you might get stuck somewhere down the line later and some other govt dept will ask you to go back and start from scratch.
All the Best & God Bless
Cheers,
Rishab