Bit the bullet and got one of these - initial impressions after a first ride are good, but we'll see how it holds up.
I ordered directly from Magene's store as there was a discount available in their DE shop. If you can't find one for your region's one, it might be better to order via amazon (if available), Magene's shipping from China and they're fairly slow.
Just to establish a base line - like Merry's friend above, I too am coming from a Bolt v1, so stuff like offline navigation, ClimbPro and the like have been foreign concepts so far

The main motivation for a new/this purchase were the Bolt's degrading battery life and the Magene's dualband GPS and bell (yes, really - one less separate thing on the bike).
Bit of a roundup dump coming up for now, let me know if you got any specific questions though!
The Good
- GPS data is flawless (as expected with dualband), elevation data looks spot on and there's essentially no jitter - not too many woods for now though, so the first gravel ride will be the real test
- plenty of screen customization options in terms of layout and data, the only missing bits are longer averages for power and HR in my opinion, e.g. 5m/20m power, hopefully will be added eventually
- alert sounds are pleasant and get your attention without being annoying (I disabled navigation voice prompts from the get-go though)
- the bell seems to be loud enough, a few reviews indicated otherwise but it worked all 5-6 times I used it on the ride
- in parts, the app and the (can) lead separate lifes which I really like: Routes have to be added to the app, then imported to the device - might be an annoying extra step for some, but I think I'll really like not always having everything in there at once. Similarly, you can edit some things (primarily screen setups) in the app without the device connected and it'll sync later.
- .fit file exports and data structures look really good, not necessarily a given with some Chinese sport devices (looking at you, Oppo/Oneplus)
The so-so
- map logistics will take some getting used to and are a bit weird: instead of region/country maps, you choose specific areas on a map that are then downloaded - you can also deselect any of map/offline navigation/climb data, but despite omitting nav data, the device will still try (and then obviously fail) to reroute until you rejoin the route
- battery life seems to be trending towards the lower end of their "17-25h" claim, though that might/will be dependent on widgets/navigation I reckon
- as indicated by Merry, the display itself is very nice but definitely prone to some glare - not worse than the Bolt (without backlight) though
- coming from the Bolt, ClimbPro still feels gimmicky but maybe that'll change over time. That said, the device had a panic attack on one of the 5-6 climbs where it constantly started and stopped the climb despite no obvious issue with the route, GPS data or whatever else, maybe just a one-time outlier.
The bad(ish)
- all roads are unnamed in navigation: I'm not sure whether this is due to skipping offline navigation data (and will test that tomorrow), but while the map clearly shows street names, they aren't used in navigation hints
- no ability to edit HR/power zones in detail as far as I can tell - it just uses FTP/MHR data to calculate those itself
Update:
- the "unnamed road" issue persists even with navigation data downloaded, will give them a headsup on that
- rerouting (somewhat obviously) works with navigation data downloaded
- rerouting resets your map zoom both on the beginning and end of the newly-calculated bit - might be intended though
- somewhat curious, but explainable map data choice: all paths/tracks that bikes aren't allowed/expected on as per OSM data aren't displayed at all