I don't have the i420 but i have the m420 and the xl chamber and i love mine.. Just kinda gave up on smoking and passed it down to my buddy for him to put some use to since i'm converting to vapeing.. I have a mflb for the time being but i'm about to order the extreme q.. But the incredibowl is a sweet piece and you'll definitely like it
I love it, saves a lot of weed. .3g lasted me and a buddy 10 hits each. Be careful when you first hit it, its a bit harsh the first few hits.