I've never had to send my six HKs in for any service of any kind;
USP Tactical 45, P30 40, twin P2000 357s, P2000SK 40.
Quality interaction with HK-CS,
while ordering hard to get parts at exceptional prices,
has been my only experience.
Six of my last seven handguns purchased have been HK.
And the are mostly all I carry for self defense.