U-tube Destination Timeshare is a familiar tugger and an experienced MVC owner using II.
MVC uses II as their internal weeks exchange platform, so you will get preferential access to other MVC weeks inventory in II, before it is released to the wider II membership. There is also a small amount of home resort preference, so if you want to go back to NCV, but for a different date, you will have that choice.
II can take a bit of getting used to, you can't choose the views, but with a bit of experience you can work out what resorts honour the unit codes that are assigned to II reservations and which don't. You will get lower unit placement preference than MVC owners using their weeks or points, which could get you a dumpster view at a resort, if you are travelling in peak season or to somewhere that has dumpster views, not all resorts do....
Some timeshare brands release inventory 2 years ahead and others (Hyatt, DVC and Four Seasons) only 5-6 months ahead. Just because somewhere is in the II resort directory doesn't mean it will ever become available via II. e.g Only Disney Orlando is available, so no chance of getting Cali or Aulani, and Westin St John is also very unlikely.
Some resorts only release smaller units, others a mix. e,g Westin Lagunamar and Westin Kierland only seem to release studios and 1-beds with the occasional 2-bed available in low season.
There's great vacations to be had via II, so give it a go, be prepared to learn along the way and enjoy!