Well, I'm sure you're already aware that Space Invader at Blackpool Pleasure Beach is the same model of ride but in the dark. So if you've ridden that then you've ridden a 4 Man Bob.
4 Man Bob was one of my favourites however. I often think that Spinball is like 4 Man Bob - The Next Generation.
I'm afraid it isn't, the original Space Invader was a 4 man bob, but it's been massively ''upgraded'' (an that's coming from a member of the BPB Guide) - I prefer to say overhauled. While Space Invader 2 uses the same basic layout, Kumbak coasters were brought in to modify the ride after the fatality in 2000, adding more block sections, modifying the cars to 3 seats in the interest of safety, originally it carried OTSR's and an 18+ age limit, this has been downgraded back to family ride, with lapbars and a massive backrest on the seats.
I've drifted massively off topic there though.
I would have loved to have ridden:
Thunder Looper (removed the year I finally breached the 1.4m height mark)
4 Man Bob
Thunderlooper, it looked so much fun. Unfortunately I never went while it was in service, I have always known AT with Nemesis. So yeah, Thunderlooper
There was a 3 year overlap - Nemmie opened in '94, Looper closed in '97 (possibly '96)