I've popped off expired ones into Apples. IIRC the reason why the EpiPen is not A/B rated with the Adrenaclick is because the EpiPen's orange needle tip automatically moves to cover the needle when you pull the pen back from the injection site, whereas the Adrenaclick needle remains exposed after the injection.
To be honest, if I didn't just get Auvi-Q, I'd be sorely tempted to go with Adrenaclick due to size in pocket. I typically carry two in my pants pocket (I don't like bags/coats because of how temperature sensitive the things are, plus wanting to make sure I have them if I need them). Two Epis essentially take up an entire pocket. I'd say between the smaller device size and the smaller size of the two pens together (versus the larger "clip" mechanism and cases for EpiPen) it takes about half the space in pocket for Adrenaclick vs. EpiPen. Both Adrenaclick and brand Epi offer copay coupons that are $0 with commercial insurance (although I don't know what Epi looks like on high deductible plans). Without commercial insurance but below $100K income Auvi-Q is free (EpiPen has a patient assistance program too), and even if you weren't eligible/didn't want to apply for an assistance program I believe that Adrenaclick @ CVS is $110 with a max $100 coupon value for $10 out of pocket for Adrenaclick.
I wouldn't really worry about dose reliability - they've all had recalls at one point or another, and none in any frequency that would suggest it's somehow worse than EpiPen.
If it helps, I haven't seen a recall for it in recent memory. Granted, it wasn't so widely used until this year.
They aren't available where I live, but my understanding is that the device mechanism itself is identical to the old EpiPens (and new ones, on the inside) and should be just as reliable.
The Adrenaclick is by Impax Labs/Lineage Pharma (as wholly owned subsidiary). It has a different profile than the EpiPen (it's smaller) and is not A/B rated for the reasons described above (e.g. if your prescriber writes a prescription for EpiPen, even without the "dispense as written" box filled, it cannot be filled with Adrenaclick in many states - some states do allow pharmacists to substitute based on certain criteria though). This is Adrenaclick: http://www.epinephrineautoinject.com/
The generic Epinephrine auto-injector from Mylan is the exact same thing as the Brand EpiPen by Mylan (same size, same mechanism, etc) and is equivalent. That's at [url=https://www.my-generic-epinephrine-auto-injector.com/].