SlimDrivers

I think that this program's crowdsourced data should mean that it will eventually outperform all other options. However, at the moment, the program often recommends wrong drivers when I use it.

DriverEasy detected more drivers than SlimDrivers. So I prefer DriverEasy about SlimDrivers. After Slimdrivers had updated all drivers on Vista Business 64bit und reported all drivers to be actual and OK, there remained an "Other USB-device" not working and yellow-marked:

After "optimizing" all drivers with SlimDrivers DriverEasy reported 2 missing and 23 outdated drivers.

My Hauppauge WinTV USB Card "Hauppauge WinTV HVR-900H 64bit (66xxx)" did not work with the drivers from SlimDrivers, because the drivers for this USB 3.0-Card could not be installed:

• Renesas Electronics USB 3.0 Host Controller
• Renesas Electronics USB 3.0 Root Hub

Only with the DriverEasy-Updates I could use the "Hauppauge WinTV HVR-900H 64bit (66xxx)" which has the drivers Renesas Electronics USB 3.0 Card as a precondition.

Otherwise DriverEasy wanted to install the V7-drivers for "Hauppauge WinTV HVR-900H 64bit (66xxx)"-USB-device, without asking. I wanted to keep the V6-version, because VTPlus does not work with WinTV V7. In this point SlimDrivers had the better behaviour.

This tool tried to install an older version of a driver.
Didn't find a download limitation, like my previous favourite Drivermax. Hope they keep up this good work.
For automatic driver updates (all at once), you can upgrade to premium, but it isn't necessary.

It used to work reasonably well. About 50% of the drivers it found were either older than the currently installed ones or for different hardware entirely.
However....
They have now changed the format/layout of the app and it is extremely difficult to get hold of the download links for free. As about half of the downloads are wrong/not needed/outdated this makes the process extremely time consuming and infuriating.
I used to advise everyone to use this program as it was the only free one that worked (half the time). Now I'd advise everyone to avoid like the plague. Very disappointed in the company.

I have tried a ton of programs for opdating drivers, and this one is fine, but not great.
I prefer using IObit Driver Booster, it is much better at detecting drivers in need of an update.

With IOBit Driver Booster I have much more frequently updated drivers in comparison with this one.
Negative opinion.

For me was the only that realy works, lists only the drivers that need update. Don't list unecessary updates or wrong drivers (I've tested on 3 diferent computers).

Out of the many bad or borderline scam driver update utilities out there, SlimDrivers is at least legitimate and functional. However, its ability to detect drivers is lacking, and it doesn't allow you to see the details of the driver before you update. Being able to verify that you're installing the correct driver is a pretty basic feature and competitors like DriverEasy have it.

CPU Usage 100% on one core for displaying the GUI -.-
Forced registration (email not verified)
2 out of 5 driver updates failed, one just showed an empty error dialog, the other one said corrupted installer
Has outdated driver information, tried to downgrade a driver for no reason...
Keeps running in tray even after "updating" (or ignoring) for no reason.
This is really, really bad. Do not install it.

BEWARE this software may harm your computer. For some reason, it doesn't install the right drivers, I needed to reinstall Windows on one machine, and in the other machine I tested it, it installed drivers for hardware not even present.
Installing it it's risky.