Since PiS is to win, do you think your life shall change (for the worse)???
For the worse. PiS stand for excessive nepotism (their actions between 2005-2007 speak for themselves) and excessive governmental interference.
What bothers me most about PiS is that they will put a political spin on absolutely everything. They'll spend a lot of time trying to over regulate things (for instance, forcing shops to close on Sundays regardless of what the workers actually want) - and you'll see them directly interfering in independent institutions to meet their political aims. Polonius on here is the best example - he would openly kill legitimate businesses just to achieve a particular political aim. You'll also see them raising taxes slyly (for instance, fuel taxes) to pay for endless social initiatives. What's most disturbing is that you'll see many institutions being "taken over" to "purge" them - TVP during the 2005-2007 period was a great example, but after 8 years in opposition, the desire for revenge is huge.
To me, although not a PO voter (I voted for Jaskowiak in Poznań, but he was more or less a candidate of the centre and left rather than a PO candidate as such), I'm happy with their general direction. Not everything is perfect, but in general, the country is getting richer and is progressing in the right path.
I think we'll see PiS attempting to run a minority government, to be honest. There will be an anti-PiS rainbow coalition, but it's in PO's interest to stand back and let PiS ruin things for a while. After a couple of years, the joint PO/SLD/PiS opposition will cause the government to fall - and the election in 2019 will see PiS crushed again. All very predictable :)