T:slim is very sensitive to occlusions, which I actually love. My MM never occluded as it should have, which was too dangerous. Where I'm finding I'm actually getting the occlusions is in my tubing, not my pump - but it's a relief it's telling me it's blocked instead of just leaking into my pump, ruining it and putting me at risk for DKA. I have no problems flushing out my tubing or replacing it or my res often if I know there is a problem, keeps me out of DKA territory. I know it's sensitivity is often a complaint of the pump, but it's a great design and actually a very valuable feature.
I took apart my first reservoir after my first Apidra occlusion and destroyed it to see what was in side(I'm geeking out about the tech inside), but it allowed me to find out exactly what was going on and where a potential problem could arise. Apidra does not gel in the pump, that is a rumor. The reservoir works by using a pressurized baggie to hold the insulin, this does not make insulin crystallize - think about the vacuum of an insulin vial and the pressure inside. Apidra as of late has been more temperature sensitive(body temp is doing it, when it's rated supposedly be able to handle up to 98.6 like other insulins), not sure why it's doing it, but it was even crystallizing in my MM at body temp and where it didn't in the past. There were no crystals in the reservoir of the t:slim, so I do not believe heat in the pump itself is the issue - I also checked it's temp constantly, even while charging with and without a reservoir in, it was fine.
No air bubble issues here, but you do need to make sure the luer lock is tight, but you have to make sure of that with any luer lock pump or there will be bubbles. Another thing is that you want to watch when you fill is not go too fast when filling the reservoir or there could be bubbles introduced there, just like when drawing up insulin for MDI.
Touch screen is great, and the menus are very intuitive.
Those are just my thoughts for now.