Product review (3 stars): Works with some minor issue
Having decided on getting an LG dryer, I also had to get the side vent kit because my laundry closet's exhaust vent requires side venting.  After installing everything, the LG side vent kit works as designed.  However, I would suggest to keep in mind the following things:

1.  Assembling and attaching the kit is a little tricky, so you may want to consider an LG repairman.  With that said, if you consider yourself even just slightly a handyman, I think you can do it yourself.
2.  As the instruction diagram shows, you have to insert your arms into the two 4-inch hole (at the back and at the side) to connect the ducting.  In a sense, you will be working blindly and feeling everything with your hands.  The most tricky part is duct taping the elbow joint to the inside duct.  But fear not, it's not as difficult as it sounds.  Just make sure you have a lot of space behind and at the side of the dryer when you are doing the side vent installation.
3.  As others have mentioned, the holes may have sharp edges.  I applied some painters tape around the hole to cover the edges.
4. Before connecting the first duct inside the dryer, check first that all 3 parts fit.  (The inside duct, the elbow joint, and side duct.)  In my kit, the elbow joint and side duct fit exactly.  However, the inside duct and the elbow joint did not.  My solution was to get a pair of pliers and widen the elbow joint opening by carefully creating a flared opening that can take in the inside duct.