Laptops don't usually age well. Gaming laptops even more so. Your choice at the end of the day but do give it a good canned air cleaning before you start hard gaming.
I am getting rid of a bunch of old computers I don't need anymore on eBay and I was thinking of trading them all up for a used Alienware m11x. I know it is an older computer but it seems very capable, especially for the size and for the price I can get it at. (400 or less, USD). It has up to an (older) i7 with a 1GB video card. I can update it with max RAM and SSD which seems like it would be a great computer for many more years to come.
Is this a good idea?