Your potential to develop the Alphas - like all alcohol markers - but only on specially coated paper. Now you can create perfect color gradients or blends. Here are recommended: Blender. These are markers you can like Tintenkiller with which perfect the courses.
The markers come along in a nice cardboard box very stable, which can be closed with magnets and inside a sorting system for the pins has (similar to a beer crate) ^^
As mentioned above, quite reasonably priced (costs only 1/3 (!) Of the price of a 36er Copicsbox)
but not for rumschmalern (too bad) or suitable for children! (1.Alkohol and 2. I guess the color is not too healthy ^^)
CONCLUSION: The Alpha Twin Marker pens are good based on alcohol which rank high on a par with the Touch markers and are very attractive just by price, but the copics can not dethrone ^^
PS: Here are examples of the required paper ...
COPIC marker block A4, 70 g / m², 50 sheets or COPIC marker block A3, 70 g / m², 50 sheets