I must admit to having misgivings about pre-installed SSDs, but was pleasantly surprised when the Windows 10 SRW provided worked flawlessly first time. No hiccups whatsoever. Unfortunately the same could not be said about the Driver CD, also supplied, which red-flagged a PUP immediately. Luckily that eventually proved unnecessary anyway.
I have since ordered a Windows 7 USB in the hope of another painless install.