Okay, so I've been using this ULANZI cooling fan for my Sony A7IV, and wow—it's a total lifesaver! No more overheating warnings mid-shoot. The spring mount is way better than those flimsy suction cups from older models.

The fan has three speeds, and even on high, it's surprisingly quiet. I use an external mic, so noise isn’t an issue, but if you rely on internal mics, you might catch some whirring.

Battery life is decent (~45 mins on high), but I keep a power bank handy for longer sessions. The OLED screen showing temp and fan speed is a nice touch—feels premium.

Pro tip: Grab rubber stickers if the mount feels loose. Fixed my only gripe for under $5. Worth every penny!