We buy these double sided cards to supplement our standard business cards ... if we want to promote a product or event, and being double sided, you can get a reasonable amount of info on them.
At 260g the cards are pretty reasonable quality and the bane of many self-print cards has always been the edges ... these break very cleanly, and in no time at all, you get a good pile of professional looking cards.
I had no problem at all printing them on my Canon inkjet printer ... although I would not recommend using Duplex mode ... we tried, and it was a bit of a faff.
Dyring was good (we do use manufacturers cartridges, and there was no evidence of smudging.
All in all, and for this price ... very good. Perhaps a point off for not being quite as easy to break apart as they used to be.