It's probably not as good, thats not to say that its not helpful but their is a limited range of the types of clips. There is however, over 180 clips which means you probably wont be repeating clips.
First off, many clips have been filmed in the same streets, so you can almost anticipate what hazards are coming, not good. Second, loads of clips suggest cars signalling are hazards, there is a big emphasis on this and again not good. In the real theory test, its unlikely that the hazard will just be a car signalling to turn - don't get hung up on that one. There is also a distinct lack of clips where drivers cut across other drivers from different lanes and finally next to no clips filmed in the darkness. Also, if you have lightning quick anticipations, you might be at a disadvantage with this software i.e. you spot the hazard before the computer does. Its always best to click it a few times just to be sure its registered your click in the scoring window.
Use Focus MM, its a better all round help and gives you more a range of hazards and a better idea of what to expect in the real hazard perception test. Don't hesitate to use this software but just beware and establish exactly what hazards it is that you need to spot. Its not always clear, after all the test is still in its early stages, so maybe the DSA will consider improvements in the near future.