A while back (2013) I bought some BTC and followed the advice about devising an unguessable pword and not writing it down..  Instead, I left clues for myself that I thought would be obvious.. a couple of years later when I tried to access my wallet I tried maybe 50 combinations and was unsuccessful.   Contacted the legendary Dave Bitcoin / https://walletrecoveryservices.com/ with little hope, and two years later he came back out of the blue to tell me he periodically revisited wallets he had been unsuccessful in cracking previously and had managed to crack mine.

 As others have said, Dave took his 20% and no more; he could have helped himself and to everything and I would have been none the wiser. To top it all by then I no longer had access to the wallet so asked him to transfer the coins to a newly created account.  They were there in minutes.

 Dave comes across as polite and friendly , he certainly is a person of integrity and is honest and true.  He is also incredibly talented. Recommended without hesitation.