I purchased both pdf and physical cards full of doubts. Unnecessary, as it turned out. The cards are simply great.
The cards arrived in solid cardboard box, that was deliberetly made be resistant to post services. Inside of the package there were cards in a solid plastic box. I wasn't expecting the box but that nice addition that definitely extends the cards' lifetime and make it easier to keep them in one place.
The cards themselves are divided into two decks - Conditions and Numina. Back of the cards look the same, with the sole exception of the deck's name. Colours have good saturation and print quality is very high. I could have some minor complaints about the quality of the logo, which in my opinion could be better, but that's a very minor thing that has completely no impact on usage of the cards.
The cards habe standard poker playing card size (2.5"x3.5"). The quality of the cards themselves is high and absolutely comparable to any regular playing cards you may purchase from regular store. This includes of course a thin layer of plastic cover over cards that extends their lifetime and adds to their resitance. The thickness is also satisfactory and I expect that the cards can last for relatively long time.period even without putting them in cardholders.
To summarize - Mage condition and numina cards are excellent product that makes your life much easier. While they are not necessary to play the game they make it much easier and highly improve the comfort of the game.