I've realised people are rating this game down because of crashes when it tries to play cut scenes, this can easily be solved by going into the game's folder and deleting the .SWF files from the INTRO and OUTRO folders.
I don't know why it crashes and really, it shouldn't be on here unless it works but it's on here and it's a decent game once you get past the stupid cutscene bug.
I love the Diner Dash series, I think HH is another decent rung on the ladder really, though in all honesty I don't think it's worth £7+. Well, I suppose that's a bit harsh, it could probably scrape worthiness by playtime as if you were to sit and play the entire thing through it would take you an hour or two (I hesitate to comment on its worth as I can think of cheaper games with more substance).
I did, however, find the Endless mode on this game to get ludicrously hard quite quickly, no idea why. Maybe my parents taught me poor coping strategies.
TL:DR - It's a fun little game that you can easily waste several hours on, over time, and it very easy to pick up and drop whenever you feel like it (the plot, for example, will not have a profound effect on your life and dreams).
You will also find yourself passively aggressively judging the customers when they get pissy and shake their heads at you, but it's okay, becase you're fabulous.