With a name like "dropzone" I'm going to say they are good for one thing, dropping car. Honestly, I'd look at, depending on how low you want to go, some FMS C Springs, H&R Super Sports or an Eibach kit.
im getting maxspeeds off ebay in the next month or two...only $110 shipped and give a nice drop, somwhere between 1.5"-2"...and i havent seen anyone need C/C plates. :thumb:
Most popular are H&R's, Steeda, M&M and Eibach. I may have left a few out but that's a handful of most springs that are reputable.
When it comes to lowering your car, I would say a good rule of thumb is to not go cheap. You will regret it in the long run.
I have a buddy who bought some maxspeeds off ebay. Along with those springs he also replaced his shocks and struts with Adjustable AGX's and Max. Motorsports 4 bolt caster camber plates and it rides really well. I hear the H&R's are the best and have ridden in them and the felt good I couldn't even really notice the different in the maxspeeds or H&R's but then again my buddy did replace his shocks and slapped on some CC plates. The max speeds gave him a 2" drop in the front and about a 2 1/4 in the rear.