Hello, I’ve recent get a Cubie A5E on hand and of course, I get the dietpi for it! 
So far, HDMI output is not working, but other than that, the ethernet, wifi and nvme seems to working smooth for me.
Regarding performance, it is around ~6 second in dietpi benchmark, which resemble the performance of RK3399, which I think is quite decent.
Generic Device (aarch64) | IP: 192.168.1.184 ┌──────────────────────────────┤ DietPi-Config ├───────────────────────────────┐ │ DietPi-Benchmark | https://dietpi.com/survey#benchmark : │ │ - CPU Performance : Duration = 5.79 seconds (lower is faster) │ │ - CPU Temp : Idle = 42'c | Full load = 56'c │ │ - RootFS : Write = 108 MB/s | Read = 236 MB/s │ │ - RAM : Write = 669 MB/s | Read = 1498 MB/s │ │ │ │ Additional benchmarks: │ │ - Custom Filesystem : Write = Not tested MB/s | Read = Not tested MB/s │ │ - Network LAN : Transfer rate = Not tested MB/s │ │ │ │ ●─ DietPi-Benchmark ------------------------------------ │ │ DietPi-Benchmark : Starts CPU, RAM and IO benchmark suite. Scores can be │ │ ●─ Additional benchmarks ------------------------------- │ │ Custom Filesystem : Benchmark IO performance from a selection of mounted d │ │ Network LAN : Benchmark LAN performance using 2 DietPi systems. │ │ │ │ │ │ │ │ │ └──────────────────────────────────────────────────────────────────────────────┘
For the temperature, the CPU governor are not working either. Hope it would be resolved together with HDMI output in the new release.