Be very careful on which headlights you get.  Honestly i bought a set of cheapy lights for F-250 and it was the worst mistake.  They yellowed out after about 3 months and I could never get them aimed right and mounting was just plain weird.  So I just opted to spend $650 on a set of real Harley Davidson Editions.  I had to cut out some of my shell, but I knew the headlights i was getting was real ones, and not just cheap knock offs.

If the company is offering a guarentee or warranty.  And there's not weird modifications then i would do it.  But if they're just a dealer for a company, and things don't seem right, just walk away and save your money.