I recently purchased these sets to expand into being able to have a full wing of six. These cards are definitely different from those printed into the original boxes. That said it is easy enough to have these purcahsed cards replace all Grace, Intelellect, or Strength cards that a player woudl need. The issue would come in with the addition of the trait cards.

The last time I played Phoenix Dawn Command I used a Rank 3 character with a mix of old and new cards, and given that the split was fairly even it wasn't easy to tell what I woudl or wouldn't pull based on the card difference. If only a single card were replaced though it would be very noticeable.

The additon of the new traits though is a definite Pro to purchasing these sets, as any new/additional material is great to have!

These cards are alright. Though by slightly different they really mean they are totally different. If you were to mix these with a normal deck it would be very obvious which cards were the original ones and which were these. The original cards are very nicely made, and have a non-glossy texture on them. These are very glossy and generally are of poorer quality.

All in all if you are going to have five or six players constantly you might be better off getting a second core set. That way you have spares.

Also do Not get these if you are replacing a lost card. It will be totally obvious and defeat the purpose.