I am back from the streets with real data transmitted from my rear.
After a few hundred miles of mixed driving on varying qualities of road surfaces I could say that for me I do enjoy the lowering springs. I can't speak for other brands, but Whiteline dances on the edge of being too much at times while improving handling. The only annoying things are drastic surface changes such as going on and off a bridge etc. Depending on how poor the transition is, rapid suspension compression is followed. This is also on stock dampers/struts which I don't recommend but it get the job done. I am just talking about ride because I know a rear sway bar upgrade will skew how I feel about the suspension as a whole. Which if you wanted to "wake up" a FWD car a RSW definitely does. With the post above this I do agree it will be it is very subjective to each individual and road conditions where you drive. I live in a rural area with roads that are kept well with minor potholes and irregularities. My previous experience with a "modified suspension" was with a 240sx with cheap coilovers. So yes, it's a middle ground from going to a coil over setup but you get what you pay for. I feel like this is just a review for lowering springs in general than for Whiteline's springs. If you check the data on the spring rates it's not very much stiffer than stock. without checking, I believe it's within 50lbs of the stock rate. I hope some this is actually useful.