Honestly, I still have a lot to learn about this, but the product seems very well built and Paul has been tremendously helpful. I had searched high and low for something like this, and I think it's an outstanding value for the cost. Worth trying for sure. Thanks, Paul!
Purchased two each of 16 MHz and 20 MHz versions, and wondered if I would have to use ICSP for programming the fast one - but that wasn't necessary. I found a description somewhere else about installation into the Arduino IDE; you will have to enter the URL of a json file - then it goes automatically. (Go to menu File / Preferences and enter the address in the field Additional Boards Manager URLs). I then had to fiddle with the baud rate setting in the file boards.txt - it was the variable atmega328pbcc.upload.speed that had a wrong value. (Perhaps something you could clear up and put somewhere on the web page, Paul? - or have I overlooked something?) It is great to have access to three 16 bit counters in this small package! A 20 MHz clock gives a nice round period of 50 ns which simplifies some scenario. On the other hand: I moved a project from an ATmega2560 to one of these boards with the code hand-tuned for a 16 MHz clock - its not so simple that faster is better! I prefer the clean port numbering scheme over the Arduino pin numbers - but it is handy to have both in a spreadsheet file when you allocate pins and resources for your project; many libraries refer to Arduino pin numbers. These boards are very much recommended.
The Oscilloscope current probe adapter is an excellent accessory to go with any oscilloscope, the type of connections onboard are perfect and it seems to be extremely responsive. The only 2 things that would be good to change would be optional simple acrylic case similar to those available for the bus pirate. The other would be an onboard boost converter so that it didn't a separate power source for current measurements above the input voltage, although i understand this would add much complexity and cost.
I recently got a batch of tiny SMD ATTiny24A's and needed a way to prototype easily with them.... and this is it. It plugs in a standard breadboard, has a 6pin ICSP header and a zero-insertion-force socket to hold the chip in place. I am new to programming adapters, so it took me a couple of tries to place the chip and the cable in the right direction, but now that i got it right, it's all good.
Predictably, when you are facing the "ATtiny SOIC-to-PDIP14" silkscreen markings, you want your pin 1 (marked by the little hole) at the top left.
Leonerd was very helpful and friendly too, so that's cool too.