Help with US appliances in Poland - Power converters?

Hi everyone...does anyone have experience with these step down transformers/converters? We have some smaller appliances likely about 300-700 Watts (Kitchenaid Blender, stand mixer, etc.) along with a 1000W blu-ray home theater system (yes I am aware of the Pal/NTSC implications).

I'm thinking of going with a 3000 Watt setup to be on the safe side and possibly be able to use 2 or more appliances at the same time but the ones on Allegro say they are 230V/110V adapters while the ones I'm considering on the amazon.us site are 110/220 ( amazon.com/Power-Bright-VC3000W-Voltage-Transformer/dp/B000 MY02LQ/ref=sr_1_1?ie=UTF8&qid=1307978233&sr=8-1 ).

Any help would be highly appreciated. Thx in advance

I am using two Seven Star TC 1500 W converters that I bought on Amazon similar to the one at: 110220volts.com/TC-1500.html. One is used often with a 10 Amps vacuum cleaner (makes it 1100 W I guess) with no problems. I think it is better to buy two 1500 W than one 3000 W. The appliances will be in different rooms and if one breaks you can still use the other one.

Make sure the power converter is suitable for the actual device you are going to use in Poland. Some will be fine with motors but not with electronics. There is a bit more to electricity than just Volts.