I have several, and they are pretty accurate , as they are all unbuilt!
the big difference is the models all still fit in one box, while the real thing is spread out over numerous boxes and drawers and shelves, some parts in the shed, some in the garage, some in the house...
mine are all plastic model kits though.
I have a few die-cast, but they are future dreams (mainly a 66 Corvette coupe in Blue) and a 65 GTO. My sister gave me a green 71/72 back when my 70 was green...
but the ones I bought were from Costco, under $20 each...