So the Thunderbolt one is a clear TPU style case for the Nintendo Switch Lite. There is no actual "thunderbolt" insignia on it or anything, but it does have some "rings" on the "grippy bits" that are thicker braces, which is an understandable feature -- you want those grips to be tough, it's an indicator of good build quality.It fits just right putting your tumbs right above the analogue stick and button pad. It's much more comfortable than the default flat version. The grip really helps, the device is SIGNIFICANTLY easier to hold long term in my ogre mitts. The button passthroughs for volume and power are nice and prominent, with the power a little more recessed than the volume. It doesn't add a lot of bulk to the setup, being only a few mm thick.It was easy to install, just slide the switch into the case at the bottom and then snap it in at the top. There are cut outs for almost everything.All told it's worth buying, as the grips add to the ergonomics, and the clear TPU protects the device from scratches et all without blocking your view (if you have a special Switch lite) or the like.The only criticism I have, and it's unavoidable due to where the slot is, is the SD card slot is inaccessible while the case is on. There is no way they could have made the grips work and have it be accessible, however, so that's not their fault. You won't ever access the SD slot after installing a SD card, so it's not a huge deal.
