I have used several Zeblaze models, but this particular one, being the latest release to date, is very disappointing. Its firmware is outdated, slow, and obsolete?it's like using a Zeblaze GTS 3 Pro from the year 2023. I do not recommend buying the Zeblaze GTS 4 at all, as it doesn't feel modern and aesthetically it's not attractive either. I highly recommend the Zeblaze Beyond 3 Plus for aesthetics, fluidity, and modern firmware.