A little confused about 3DS nand/emunand

I'm a little confused with all these threads about 3ds hacking
So here's the deal :

I'm thinking of buying a 3ds 4.0.2.5 with emunand 10.3 ?

What do you think of it ? I thought i need a linker to run 3ds roms or i just have to put the rom in the SD card ?

And what about future games will they work in this version or not ?

Thank you for answering my questions and sorry for the thread because i didn't find my answer yet