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Typically, they would use a stacking header when making a prototype board like this, so the pins will go all the way through to the arduino and allow you to stack. This would leave the extra set of pins for each connection open for soldering. In this case, since they've used both set of pins, you must use dupont connectors to get access to the pins. I'm sure that's fine for a one off test project, but since I'm making a product for people to use, I need everything soldered.
Excellent quality, love the Keyestudio-yellow look, and the breadboard not being attached is a bonus - I can use these for either solder projects or prototyping - have done both so far with great success.
Reason for 4-stars rather than 5 is the oddity of having alllllll this GPIO brought up to the proto-board with all the fancy yellow connectors... while totally skipping that female 40-pin mega-IO header at the rear. To use those pins, even for dev, you have to either add your own f/m pins, or solder directly to the board. Definitely a miss, especially for something otherwise easily worthy of a 5-star review.
The quality of these boards is amazing, especial at this price. Lines up great with the 2650s. The packaging is also impressive. (so nice in fact, I can't bring myself to throw them away. I keep telling myself they can be used in a project somewhere.) Really well made product. Highly recommend.
I used it to get pin locations and built a custom 'hat' that I used to make the connections I needed. It looks like it's built good and the proto board looks good. I found he small size of the proto board a little tough to work out parts placement but I got what I needed.