Universal Bee, are they good?

[blueskull]

Hi,

Has anyone used Universal Bee product line? I'm particularly interested in its 16kB QFN20 3mm*3mm version.
My previous choice was STM32F070, but it seems like its USB library documentation is not that friendly, and it requires an external oscillator.
The oscillator-less STM32F072 with QFN28 package is $3 each, which I can not justify its value.
Then, I came across the Silabs one, it comes with USB, ADC, PWM and on die reference, USB oscillator and even 5V input LDO.
Seems like it gives me a single chip all in one solution at $1.1, and it comes with free Keil C compiler and equally nice graphical configuration tool just like STM32.

So, any opinions? Any experiences? Any possible traps for young players (I'm new to device side USB)?



Thanks,
Bo

[westfw]

any opinions?

It's an 8051 thing.  Eww!
I have no feel whatsoever for how a C implementation of USB would run (space or performancewise) on an 8051 architecture.  You might want to see if they have some example projects that come close to what you want to do.  How about a Happy Gecko instead?