Pros - super duper fun and awesome.
Cons - you'll almost certainly want to change the trigger right off the hop and then may be tempted to start adding other bits and pieces to make it perfect. Total cost sunk into it will potentially be around the $2000 to $2500 mark all-in.
Recommended parts:
Triggertech FX-9 Trigger (or other trigger upgrade)
H3 Buffer
$1.50 in canuck quarters in the buffer tube
Techwell Magwell
Upgraded stock (I went Magpul CTR)
Pistol grip (like an MOE grip)
Optics and irons
What’s the deal with quarters in the buffer tube?