I can attest that SB SD Mods did a great job installing my SX Core Pro and was very communicative.
He also did this service in one day and returned as well, just took the USPS a day extra to get it back to me, 4 days, but not his fault.
I highly recommend his service and will be sending a second one to him soon.
Also, I recommend using UPS or Fed Ex, they offer comparable rates and probably faster. USPS mail delivery has been really slow lately.
You can definitely trust he will do a great job installing your SX Core!!!!