Insurance cost changes

I just finished investigating 2019 drug costs under my Medicare Advantage Plan, which I've been in now for 3 years.  Sneaky details:

    I've used the mail order drug delivery service for 3 years because with my previous, employer sponsored plan (also though UHC), was the cheapest option.  Ahh, the devil in the details.  Somehow I missed that my new Advantage plan has a somewhat complicated system wherein tiers drugs above Tier 1 have varying co-pays depending on whether you use mail service or a local pharmacy:
                   Local                    Mail service
Tier 1         $0 Copay              $0 Copay
Tier 2         $9 Copay              $0 Copay
Tier 3         $47 Copay            $131 Copay
Tier 4         $100 Copay          $290 Copay
Tier 5         33% Coinsurance 33% Coinsurance

So, Tier 5, best not need that!
Ibandronate sodium for bone loss is a tier 3 drug. My others are tier 2.  The Final tally is I will save $164 in 2019 if I switch to local.  That is a useful sum although the mail order is wonderful.  

The second surprise, however is they changed baclofen and Neurontin to Tier 2 drugs, where they were tier 1 in previous years.  I am suspicious this may mean that next year they will up the price.  We really have to keep an eye on these folks. 

The bone loss drug is particularly vexing because my test results do not indicate any benefit from the expensive drug.  On the other hand, one can argue that maybe my results would have been worse without it. 

It would be useful to hear of other people's experiences with insurance coverage for medications.