I had a set from Amazon and they weren't too bad. It did the job. The major differences between that and the Land Rover branded is quality, fitment, and load rating.
I followed the OEM install guide and it works. The quality isn't too bad, but you'll notice what you get fitting the load bars on the rails. Fitment of the load bars to the rails is ok, but the locks on the load bars are a hit and a miss (hard to lock/unlock) when locking or unlocking them. The load rating on the load bars are not as high as OEM, but I was able to mount/use a Front Runner RTT on it without any issues. It also held the RTT in place while going 90+ MPH.
Overall, I was able to live past the minor issues with it and it didn't break the bank.
I got the extended rails and I didn't like them because I didn't have many options to upgrade to a real roof rack. The half rails are your best bet as you have lots of options to upgrade from there.