These are very collectible. Not quite in the same league as Victor Summer Special and maybe even not quite as much as Battle Picture Weekly Summer Special. But even so, the early ones are hard to come by, especially in high grade and include some nice artwork and war features/stories.
Expect to pay upwards of £20 for solid Fine copies that lie flat and have no horizontal crease or fold across the middle.
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.