https://www.youtube.com/watch?v=X7mZwHivyTA
This is my G3 chuck. Note how free it moves.

They may tell you to don't do this but I hose mine down with break cleaner or engine cleaner. That quickly removes all the crap from the insides and lubes it up good. You can also jam some shop towels in the back of the chuck to block dust from entering if the work item is stupidly dusty.
::SuperNova G2::
The Supernova G2 has a block to catch junk from entering which is all find and dandy, HOWEVER the Supernova G2 also lacks the robust breaker bar / wrench that the G3 has, it favors the allen-head wrench socket. The Supernova G2 also has more weight which can mean problems for lower load motors (like HP) My Supernova G2 is designated exclusively for the cole jaws which is for finishing the bottom of bowls. It makes things way easier to just pull the chuck off and slap the other one on instead of changing the jaws.
::G3::
The G3 has a very robust breaker bar and gear heads which also allows crap to enter the gear mechanism. If you have to take the chuck on and off the lathe repeat often then you want the G3 chuck.
::Spindle stuff::
Take it from my fubar experience and get a spindle washer or 2 and keep it on the lathe at all times

Metal on metal contact with torque pressure is nasty tightening strength so this can be a b!t$# to get off, it makes for a very bad shop experience, fustration and loss of turning time. With 1 or 2 washers they come off with ease. The only down side is this can introduce slop and make things wobbly. These can be made from things like milk cartons and other plastic material but you want it THICK so may need multiple layers. I keep 2 on hand.
Turners Select No-Lock Spindle Washer | Shop Supplies | Craft Supplies USA
::Faceplate::
Doing bowls? This is perhaps the best faceplate you can get. It fits to the 2" dovetail jaws (from the stock set) and allows you to easily remove the work item, reverse it and not have to remove the chuck. Put faceplate on the wood block, clamp it then cut a 2" dovetail on the tail stock side. Then you can flip it around as you wish. This results in a tighter fit and precision on the shape. Removing the faceplate from the lathe and putting the chuck back on can introduce some wobble in the material. This also speeds up time. They come in 2" 4" and 5". This one is a 2" (50mm) I would also suggest buying 2+ of them, often I find myself needing another one. One cleaver way is to incorporate the foot into the dovetail foot. That way you can toss it back on the lathe and start turning more.
Buy Nova 50mm Face Plate Ring at Woodcraft
NOVA Faceplate Ring 2"
NOVA Faceplate Ring 4"
NOVA Faceplate Ring 5"
::Cole Jaws::
The last goodness item is the cole jaws. These jaws are not the quality material you come to demand from the company. They are cast flat blocks but for what they do and their function that is plenty good enough. They are NOT for heavy pressure. The #1 job t hey do is for LIGHT cuts on the foot to remove the dovetail and make it flat on the bottom. What I did was put my 4" jaws there (can also use 5" or so) on the inside because not only do I have out but I have IN pressure. Neither of these are safe for serious cuts and use as low speed as possible. They do make replacement knobs but so farI have not had any bad things happen to mine. Keep in mind to the bowl can and likely WILL jump track and fly off if you touch it with to much force. Tail stock with a flag type live center works wonders there.