What did the Pigs do that your PL didn't? What are you hoping for from the SP?
The Breakers strengths are what made me switch out, honestly. Pigs, as is well known, are glideless beasts. The Breaker has better glide, is less overstable (or, at least, as less of a dump out at the end...they certainly both resist turn like nobodies business!) and, for my arm anyway, is noticeably faster. More than just a tic faster. It's like the Gremlin of putters...not quite fast/long enough to be a true mid-range, but longer/faster than any other putt and approach disc.
I was actually having trouble on shorter holes with the Breaker because it just kept going too long! Rather than force the disc (i.e. work with it long enough to do what I wanted) I went back to my massive collection of Pigs. Pigs just feel more comfortable for me, having thrown them so long. The Pigs I have (I don't throw older R-Pro..just old Pro and the new "Pro" which is clearly just firmer R-Pro) do beat in rather frequently, so I switch them out every few months, just to keep them beeftastic. That said, my PL Breaker broke in faster than my Pro Pigs...and that's without any sort of big tree hits. My Breakers (I broke in two PLs within six months of playing) still had that good fade, but lost a lot of their HSS. Not uncontrollable by any means, but flat throws were getting noticeable turn.
Basically what it comes down to is the same reason I throw so much Innova now. There are disc that do the same stuff on the market, some might even do it better for other people, but I don't have the free time to really dial in a disc. If it doesn't click with me immediately (recent examples: Tensor, Volt and Patriot) I'm not going to keep messing with it. I'll just go back to what I know.
What do I hope from my SP Breaker? Slightly less glide, and drastically enhanced durability. I know six months to you guys seems like a long time to work with a disc and not get it dialed in, but I'm old and set in my ways, haha. I do love the Breaker...it feels great in the hand. I WANT to work it into the bag, if that makes sense. Since it is winter, when I get my SP I'll work with it and the PL and see if I can REALLY dial them in. I'll start using them on a lot more short shots, as well as long ones. I know I can always go back to my Pigs without any negative change in my game, so we shall see!
Wow, that rambled on longer than I thought. Sorry about that one!