Here's my Firestone experience. YMMV, of course.
When the SCCX Mechanical Calvary, Southern Division, helped me install my lift, it was made very clear that I needed an alignment after.
So, when I got back to my neck of the woods I went to the Firestone. It happened to be Labor Day weekend and they were running a special. I paid the equivalent of two alignments for LIFETIME alignments!
Now, I get an alignment after almost every time my truck hits dirt. Is that excessive and overkill? Probably.
I also bought their lifetime rotation and balance service for $75 a few months later.