I have had the original 2 bike rack for this summer and it has been so awesome! It is heavy duty and works so well. I cannot believe I did not get this sooner. I have been putting bikes in the car and 2 on the outside rack. Now I can put 4 bikes on the rack so easily it is incredible. This is the updated version from my 2 bike rack and it is even better. It does not come with the bike locks but you can apparently order them as accessories. Also, it has big tire holders for plus size tires. It doesn't appear to have a way to lock the add on to the original. That is the only part that doesn't seem to make sense. But it is possibly an oversight on my part. Maybe I just need another one of those bolts with a lock and it will be like the original. Just not sure. Maybe if someone knows they could leave a comment on how to lock the add on to the original rack. Right now it is securely held with 2 bolts but they are not locked. I would still highly recommend this - great price, great product, great company, and great place to get it is competitive cyclist / backcountry!!!