I have built two J&T kits so far, and have helped my best friend and brother-in-law build theirs this past week!
Top is my daughter's M4gery and the bottom was my first J&T, a 20" A3.
The Phantom on the M4 was installed by J&T, and the entire rifle looks GREAT!
I absolutely adore these AR's, and they went together within 40 minutes. With the directions available here on ARFCOM, it was super-easy, and the parts are all beautiful quality! I've fired it many times with no malfunctions.
I look forward to many more J&T kits in the future!
I had the compensator removed on my A3 and had a standard A2 FH put on in its place. My barrel is now threaded, and with the exception of a bayo mount (will probably get that done later this year), it's as evil as an A3 can get and still look "stock."