Congrats.
I ordered my first 3913 toward the later part of the 90's, right after I returned from my first S&W pistol armorer class. Outstanding compact metal-framed, single stack 9mm. Easily one of the most popular among the 3rd gen line.
I bought a CS9 a few years later (3" barrel and uses a 7-rd magazine), which is a slightly smaller version of the 3913 variant family, and it was another excellent little 3rd gen.
I eventually had the opportunity to buy a late production 3913TSW (toward the end of the 2000's LE production cycle). It was an issued duty weapon I'd carried for a short time (having hand-selected it from the small remaining inventory of unissued models), and I jumped at the chance to buy it when they said we could buy one former duty weapon as we were transitioning to new plastic.
I've known a lot of guys and gals who chose one of the 3913 family (including the 3913, 3914, 3913TSW, Ladysmith, CS9, & 908/908S) over the years, and they've usually been prized for their reliability and general handiness.
FWIW, Midway often has a sale on new 3913 8rd magazines, although it seems to vary whether they have the mags with the curved or flat buttplate.
S&W started recommending that 3rd gen armorers replace recoil and mag springs in duty guns at either every 5 years of carry use, or every 5,000 rounds fired, but I tend to like to replace the recoil springs a little sooner in my smaller 3rd gen's. While I used 147gr loads for duty/off-duty for many years, we started issuing 127gr +P+ and then 124gr +P, and the higher pressure rounds can accelerate the service life of recoil springs. Factory recoil and mag springs are relatively inexpensive, though, and an easy preventive maintenance item.
Keep the gun normally cleaned and lubricated (aluminum frame rails). Great compact.