I had some noises from mine, but it was from the brackets not being tightened down enough. I used about half the tube of lube on the bushings and I haven't heard any squeaks or anything else.
As far as oversteer, I haven't lost traction at any point with my Focus. It never rains here, so I don't anticipate a lot of problems. I did notice an unexpected response from the car since I put in the RSB when I went through one turn at speed. I can't really describe it but I didn't feel out of control. I want to say the car responded better through the turn but I wasn't expecting it. I don't know. I definitely am enjoying the reduced body roll.
2012 Ford Focus
Sonic Blue SE 5Dr
203A Package, 6 Speed Auto
Mods: Debadged, 30% LLumar CTX Tint, MS3 RMM, Steeda RSB