I've recently returned to London after spending 6 months living in Poland (Gorzow) and thought I'd give my impressions, please remember these are my opinions only.
If you are considering moving to Poland pick a large city, I moved to a city that nobody ever goes to, and my friends/family only heard of it when it was featured on Ross Kemp's World Worst Gangs:
It was close to the countryside and I know some people prefer the quiet life but coming from London it was a little too quiet for me.
I found it difficult to intergrate with the locals, I tried a number of times to go out to bars/clubs and meet people but the local places seemed to cater for the drink focused elder community, I found a distinct lack of younger educated people around as many have migrated to the UK - Maybe it is different in other Polish cities.
Keep Busy!! I found it very difficult to fill my time, even though I have an internet business and filled some spare time with a little private teaching I found myself with too much spare time.
There will be things you miss about your home country, first few months were all new and I didn't think about them but after a while I started pining for a good Thai meal, a copy of the Times, Match of the Day and some indepth conversation.
As much as I love Polish food I sometimes find it rather heavy and miss some light Asian cooking.
I did have a great time don't get me wrong, but to live out there permanently would be difficult unless I'm in a major city like Krakow or Gdansk with a busy work life and an active social life.
The food was good and it was a cheap place to live, the experience was great but I didn't find exactly what I needed there but I'm sure others can.
Best of luck to those moving out there.
£agów (40c that day) in summer: