I have the BH and was recently OBSESSING over the Lockit Horizontal. Basically the same situation as you. Since LV stores are currently sold put of the LH, I have been forced to REALLY think about my decision. I actually went to "Bag, Borrow, or Steal" (website) and borrowed one for a week. I am so glad. Here are my reasons for deciding against it.
The enormous amount of vachetta on the Lockit scares me.
The LH is a lot bigger than the BH and just too big for my everday use. KIP I LOVE big bags!
The rolled handles were not as comfortable on my shoulder as the straps on my BH, AND one kept falling down which was kind of annoying.
With my BH, I can easily access the inside of the bag while it is on my shoulder. The drop length on the LH is shorter and I wasn't able to do this.
The LH just wasn't as comfortable overall!
I do think the LH is beautiful and more "refined" than the BH but for me, for now, I am sticking with good ol' BH.
Hope this helps!