Quite bad. This was over 10 years ago so the details are muddy... It was on BQ hardware and the first weeks it couldn't even work outside on GSM or 3G (or whatever was at the time). It was clearly developed and tested solely on Wifi. Using cellular connection make it fall apart and constantly hang.
Then it never was able to get WhatsApp working. Everyone uses WhatsApp, and had to get by using old SMS or whoever I got to trick to install the then unknown Telegram.
Eventually got tired and got back to an Android phone. An Alcatel if I recall correctly.
After some time, BQ offered a way to revert the hardware back to its Android version, did that and had a backup for many years.
It was a very messy and buggy launch, but being on the bleeding edge, it's expected. If they had offered a WhatsApp app I would have hung on way longer, it was the only deal breaker.
Myth: code can be ugly as long as it works, don't spend company time on making it look good or on minor optimizations.
The truth is that you can tell when effort has been put into a job. Even if it just works, the lack of discipline means that in the end it will be difficult to maintain and probably will fail in unexpected situations.
Every language has its conventions, but if I spot more than a line of separation between blocks of code, that is a common telltale sign of noob. Run from that shit.