Well, it works. I won't say it's easy to put together, but it works. It's a high-quality fob and I like the feel of it, but there are a lot of things I'd refine. These are all minor complaints, but they're the types of things UX designers know to design for:

For starters, let's talk about the design of the flip mechanism. Due to the way the mechanism rotates, the key ends up 90 degrees out of plane from the fob. This means that when you turn the key in the ignition, you have to rotate your hand unnaturally far to start the car. If it were in-plane, it would make starting the car easier.

And the button for actually flipping the key: while the key flips out very smoothly, it only works if you press and depress the button. The friction of your thumb on the button is enough to stop the rotation. An additional thin sleeve over the top (perhaps a chrome plastic) would be enough to prevent this.

And the method for locking the spring in place when you have to disassemble it is exceptionally difficult, Given how long the locking pin is, it also makes it nigh on impossible to get the key cut without first assembling the entire fob. So you have to be willing to irreversibly ruin your existing key before cutting the new one. I'd recommend using the included small hex key to remove the blank and get it cut ahead of time to avoid having to disassemble/reassemble the fob.

Next: the buttons. The easy one would be to say "make the panic button red." It is a different shape and location, but it's pretty standard to make that a red button so it's easy to identify at a glance. This is especially important given its similar size and shape to the blank above it.

However, the biggest issue is how similar the lock and unlock buttons are. They're the same size, same shape, and the icons look and feel almost identical. That's not a problem in broad daylight while you're looking at the fob, but they're hard to distinguish if you're in the dark or trying to lock the car as you put the key away in your pocket. This is where coloring the lock and unlock icons would be helpful, or even better, making them flat icons and putting raised bumps on the lock buttons would provide easy orientation. You could know that just pressing the button with the bumps would lock the car.

Again, It's a good product. It feels solid and I like the form factor and the way it fits in my pocket much more than the standard Toyota key, but there is definitely room for improvement.

I just wanted to make s review on my previous purchase of this flip key fob. I purchased this back in September of 2021.

I decided to write a review now because after nearly 3 and a half years I finally broke the 3d printed case. I gotta say that is good quality. I have run over, dropped, lost, and really beat this key fob up. Only just today have I needed to get a new one. Meso always has great quality products.

Defective and doesn’t respond to emails to get warrantied.