will the wi fi extenders now on the market really help??
As you might imagine, it is not possible to answer in a way that will be correct for all users.
The bottom line is that you won't know how well a product like this might work in your home until you try it out in your home.
It might help. Talk to your ISP to see if they have a trial period or money back / credit privilege if you don't feel that the service is worthwhile.
No reason to look at an Apple product for this application unless you already have another Apple router producing your wireless network. The Apple products will not work with a 3rd party manufacturer's product unless you plan to connect them permanently using a wired Ethernet cable connection.