Yeah, first time dry. Second time wet.
You can see the bubbles in the insulin, it’s easy to know when most bubbles are out.
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I can’t stand even the smallest bubble. He has such small doses that I figure it matters. I suck air out of the cartidge, fill with room temperature insulin, let the cartridge sit upright for at least an hour, tap cartridge when filling, tap connector to push air bubbles through, keep vertical. Sometimes 16 units, sometimes 30.
I no longer flick when priming, as it introduces more bubbles than it helps fix. Getting all the air out first before injecting the insulin and then filling the leur lock vertically has worked very well for me. But I don’t take a magnifying glass to it looking for baby bubbles. 
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Same here. It drives me crazy. Thank you for the info!
@BradB, as others have said, go slow. Should take ~8-9 units to get to the luer lock, and ~16-17 units to fill. Before filling your cartridge, pull all the air out. Fill the syringe and tap the bubbles to the top and clear, then slowly fill. Once I have insulin in the cartridge I NEVER orient it any way other than vertical. I then tap the cartridge and insert it into the pump, without the case on it. The case is designed to absorb shock and vibration and I want all the vibration to go into getting the bubbles to the top. I hold the luer lock in my fingers to keep it upright, while holding the pump upright in the same hand while the tubing fills. I also tend to hold the tubing up in front of the light to look for bubbles. I would also recommend doubling up on the insulin and only changing the cartridge and tubing every other site change.
@BradB, I have the newer x2, and I use a method that is almost the same as @Hammer. I too purge the air twice even though my Tandem trainer said only once was necessary. The trainer said to purge the cartridge air with a full insulin needle, which for me doesn’t leave much room in the fill needle to draw air (I generally fill all 300 units). With the newer t:locks i use 10.6 to 11.4 units to prime a 23" set, and .3 to fill the cannula. Going slow while filling the reservoir makes a huge difference for me when purging air since i get far fewer bubbles to start with. There are also some great video how to’s on YouTube if needed.
I actually like them for their ease of use and ergonomics. I am not happy
with having to purchase a proprietary connector though. No more “shopping
around” for better prices.