Toneriders are correctly constructed Strat style pickups, with the correct type of wire (to replicate the pickups they seek to emulate) and alnico magnet pole pieces. Whilst I expect they are machine-wound, the machine is programmed to replicate a hand-winding/scatter-winding process.

The kit pickups use ceramic magnet bar magnets stuck on the bottom of six steel slug pole pieces, and probably the cheapest wire that works, wound on a standard winding machine that packs the coiled together tightly, with no capacitance-reducing randomness.

The kit pickups work, but they are functional rather than interesting. The Toneriders will make the kit sound so much better, with proper Strat tones with depth and dynamics. I woudn't have a second thought about upgrading (I normally fit IronGear pickups to my guitars rather than Toneriders, but they are pretty much the same thing). If you have the cash available and can afford to do it, then I'd definitely say yes. So many people here have done it and say just how good they sound, and that are just as good as
the stock Fender units and almost as good as most boutique pickups.

They aren't a lot of money for what you get. If it were me, I'd upgrade the pots and selector switch at the same time, but you don't have to, it won't affect the sound, just the reliability.