I don't understand why transfers wouldn't work as normal between the SBS and the local. I took the M15 SBS this morning from 79th Street to 34th Street and transferred to the M34 with my Metrocard. It worked fine. Were riders able to transfer between M15 Limited and M15 Local before SBS? I never tried that.
As a side note, the SBS was sitting there right at the stop when I arrived and I had to fight the urge to just jump on. Instead, I had to go to the machine and get my receipt, which caused me to miss that bus. Two local buses passed before the next SBS. Am I the only one noticing that there seems to be more local buses since the introduction of SBS?
As another side note, when I got to 34th Street I was able to try out the MTA's new bus info texting service. I texted a special "bus stop code" to 41411 and saw that the next M34 was arriving in 5 minutes. It was perfectly accurate.