That's the basket M107A, yes.... it is of good quality and allows for more headroom or more coffee than some other double baskets. It truly isn't a La Marzocco basket, but that is what has come to be known as in Internet circles as being either LM or Synesso. Looks to be out of stock, and as far as baskets go, it is overpriced because of the demand.
I think Dan is partial to Faema-style double baskets. Others like the LM ridged. I think people may develop a preference to a particular basket/tamper combination as much as anything.
You might throw caution to the wind and try a few other baskets (assuming the Gaggia is staying). Here's a link to Chris'
here and 1st-line
here, although I think they must carry more baskets than they list on-line. A good selection and pictures
here at Espresso Resource (also, they have a 12g ridgeless).
I have Cimbali single and double baskets, Rancilio single and double baskets, and the "LM"/"Synesso" ridgeless baskets in 14g and 18g, and a 21g LM triple. I never use the triple, occasionally use the singles (and prefer the Cimbali style), the Rancilio doubles are okay but smallish, the Cimbali doubles run a bit tight on a few tampers, and the ridgeless baskets get used the most. I want to get a LM single basket to try sometime.
I usually prepare the shot in the PF handle, and like that I can pop out the basket if need be even with the spring. Just my preference. When I have the PF spring out, I feel like I lost my "mojo"... it's just off.