Try it before you knock it! You can rest assured that SlimDrivers is a VERY good program. If it wasn't, I wouldn't be recommending it to anyone--my tolerance for bad software is as low as that of anyone you will ever meet in your lifetime. I am happy to help others. In fact, that's why I joined this forum: so I could share my hard-won knowledge about XP with Vista/7/8/8.1/10 refugees and other longtime enthusiasts.
I'm not sure where SD saves its downloaded drivers, and/or if it clearly labels them whereby you know which driver does what (when I download drivers from the manufacturer's site for a given desktop/laptop PC model, for example, I always label them as 'chipset.exe,' 'video.exe,' 'audio.exe', etc. and save them in a folder labeled with the model name). All I can tell you is that SlimDrivers has never given me any trouble, and it won't give anyone trouble as long as they follow a proper installation order (chipset driver first, then video driver, then audio driver, then network drivers, and then all the other miscellaneous drivers last).
In all cases except those where the manufacturer's website does NOT provide and/or list XP drivers for a given desktop/laptop model I advise downloading drivers from the official Dell, HP, etc. websites. For newer models (and there are many) for which XP drivers are not listed, SlimDrivers can come in handy. Like I said before, it helped me get my HP Pavilion Slimline S5-1020 fully functional with XP (the HP site only provides 64-bit Windows 7/8 drivers for that model). If you're running a modern (5th-generation Core or better) PC, you're going to be hard-pressed to get XP 100% working (i.e. with all motherboard devices operational) without a driver updater/checker program. It's like fighting for the heavyweight championship of the world and only being able to throw left hands for the entire twelve-round (it should still be fifteen, but I digress) duration (you couldn't throw a right at any time; if you did, you would immediately be disqualified).