From the experienced sellers on eBay, they were pretty confident about the lock off and non-lockoff. Multiple people telling me the price is different for Harbour Lake since its not all lock offs like at Beachplace Towers.
I'd rather have peace of mind knowing I have a lock-off unit deeded to me so I can get my II double vacation.
I wish my 3 bed at GV would get me 2 1-bedrooms and a studio
But that's just being greedy I guess.
Here's Harbour Lake's calendar; it has fixed "Platinum Plus" Week 52 intervals but no indication that those are fixed units, and it doesn't appear to have any other fixed intervals.
If what I wrote above is correct - again, any Harbour Lake owners should please feel free to correct me I'm wrong - at resorts with floating calendars and a mix of same-size units with and without lock-off capability, the fact that a deed has a unit number that correlates to a lock-off unit IS NOT A GUARANTEE that owners will be able to book a lock-off unit. It doesn't seem to me that you actually have the "peace of mind" that you think you do.
I understand what you're saying but really, it appears you've been steered incorrectly by the "experienced sellers on eBay." Yes, available lock-off units can be separated so that both are used at the home resort, or, both are used as II deposits or owner rentals, or, any combination. BUT that all hinges on whether you are able to confirm a lock-off unit at the time you make your reservations. If other same size/season owners confirm all of those available units before you're able to secure one, you'll be out of luck regardless of the unit numbers in their and your deeds.
A few weeks ago there was a thread from someone who didn't request that the 2BR be a lock-off at the time s/he made the reservation and when s/he realized it months later, Owner Services was unable to amend the reservation because all of the lock-off units had already been requested/allotted. I haven't been able to find that thread in a search but this is something you should fully understand before you begin to use your new purchase.
[edited to add]
I'm not trying to scare you.
One thing that may be in your favor is that Harbour Lake is known for being one of the best Marriotts if you have young children. Chances are good that because of that there will be many owners who request a non-lock-off because those are set up better if you have young kids (no interior locking doors between the two sides, no double entry doors, etc.) It may well be that at Harbour Lake the more popular request isn't for a lock-off unit, leaving you in a good position to get them routinely.