I don't really want to disappoint you but I've seen those cars of Legend Car being driven at Zolder a few years ago (they had the Murcié, 360, 996TT back then doing a few laps). Though it is super cool to be able to drive them, they are all driving after each other and at a pretty slow speed. A friend of mine has done this at Spa and he confirmed it. He really loved the fact to be behind the wheel of such cars. But he was annoyed by the fact you have to follow each other, in which the first car sets the pace for all other cars. In his case during one session, someone was driving the first car really slowly around the track (even slow for public roads: not pushing on the straights not to mention the really slow speeds in the turns). Spa maybe not an easy track to drive on, but there are quite a lot of sections where you can reach high speeds and a lot of fun without going to the limit.
But I also have to say he did this three times; twice on public roads, and once at Spa. He liked the public road drives the most (on the track he was always blocked by a slow driving car in front of him he had to follow). The fact he did the drives on the road twice, says enough. He really liked it. You also have to follow each other, but due to traffic, this rule can't be maintained strictly so gaps arise and some nice driving can occur
So basically just for the thrills of being behind the wheel of some amazing Italian exotics and German high performance sports car, this really is a good formula to go for (for both track sessions and public road sessions). But if you're looking for the thrills of revving these cars to the limiter, flooring them on the straights and attacking the corners with acceptable speeds, you will be disappointed.
I would suggest going for the public road tours. You can spend about 1 hour driving (20 min per car) instead of only 2 laps per car on the track (ok if you drive really slowly it can take long, but that's not fun). And you have a lot more fun driving them on the roads, cause you get more thrills.
If you want some more info just ask me