If they use a good Wifi card or it can be opened easily (which should be a given if RAM can be upgraded). I bought the XPS13 2015 and had a lot of struggle with

If they use a good Wifi card or it can be opened easily (which should be a given if RAM can be upgraded). I bought the XPS13 2015 and had a lot of struggle with it until I exchanged the Broadcom card for one from Intel.