Although there are six games on this compilation, three of them - Quartet, Back To The Future and Ghostbusters - are poor, and Wonderboy is only average. The Eidolon and Aliens are great, both combining atmosphere and playability superbly.
The latter two games are already available on budget - it might be better to buy them separately and save some money.
The Eidolon is one of the best ever Amstrad games, and Aliens and Ghostbusters are both great. The rest of the games aren't very addictive and won't keep you occupied for more than a few hours.
Check to see whether you can buy the three best titles on budget first before parting with your cash.
Again, the three best titles, Ghostbusters, The Eidolon and Aliens are already available on budget - the others are all poor.