When HP stopped making Advanced Satin Matt in an A4 size - even though that was the recommended paper for my printer, I was not too happy: I hate glossy paper - and wasn't sure what I was supposed to use instead - and HP was unhelpful in the extreme, when I emailed.
But being forced to experiment has turned out to be a good thing, in the end, since this paper - premium "Plus" - is excellent. You don't get the instantly dry print of the advanced papers, but you do get really excellent colour reproduction with HP Vivera inks. You just have to be careful not to put a fingerprint on your print as you lift it off the print-tray. HP recommend at least 24 hrs drying time. Result: lovely prints that don't reflect glare.
If, like me you have been trying to make sure this paper is compatible before buying - DON'T use the HP website (I found a couple of pages that insisted it was not recommended for my printer/ink combination). But on the box, HP claims 100 years (permanence rating) for Premium Plus with "select HP Vivera inks". Your prints may or may not not last 100 years - but they will look lovely. It may seem a lot of money for 20 sheets of A4 - but definitely worth it for special prints. For everyday photo printing you can always use a cheaper paper.