We have a XGPS170. I have mixed feelings about it.
Positive:
- It quickly acquires satellites
- ADS-B seems to work well.
Not so great:
- The app, which is needed to update the firmware, in only available for the iPad (not even iPhone). Support promised new apps, also for Android, for later this year.
- Since the last firmware update, the airspeed is fluctuating be around 5 kts. Same effect with iFly on Android and iPad. Didn't have time yet to verify whether this is iFly specific or if the same effect occurs if I read the speed using the XGPS app.
- Does not automatically re-connect via Bluetooth with iOS. Support mentioned that this is a known problem, no solution yet.
- The XGPS will only indicate that it is full, when it either gets charged with the car charger or an iPad charger. Even with the iPad charger, the 'full' indication works only 8 out of 10 times. With other USB chargers it will either continue to indicate that it is still charging or show an error code - even though the battery is already full.
It is certainly an OK device, I might even buy it again, it however feels more like a prototype than a finished product. While their support is pretty responsive, the progress in engineering seems to be slow.