My advice is no. The only double layer media that we consistently recommend around here is Verbatim brand. Best Buy sells Verbatim in the US, but I don’t see them on that Canadian site. Here are the Verbatim DL disks at Newegg in Canada: http://www.newegg.ca/Product/ProductList.aspx?Submit=ENE&N=2010100071%2050001649%201087408098&name=DVD%2BR%20DL
Those Maxell are probably made by the same company as the Memorex, just sold under different brands. I don’t know that for certain, but I’d say there is a good chance both are Ritek S04 disks.