I booked with them through Groupon for a friends birthday. It was all booked and arranged until the day before we were due to go when they cancelled the appointment stating that they had technical issues with faulty harnesses. This they completely blamed on a manufacturer.
I rearranged our appointment for them to cancel again stating they had a new booking system and everything had to be cancelled. They also stopped taking bookings for weekday appointments citing complaints from neighbours of the site. The third time I arranged the appointment everything seemed to be going well. They then cancelled every single booking for the rest of the year siting bad weather (at the time of cancelling we were in a heat wave) and stating that they had been locked out of their field (yet again something else that is apparently beyond their control as with everything with them!)
They asked for people to fill out (yet another) form on their website stating if you wanted to hold voucher rebook for next year or refund. All queries they assured would be dealt with within 72 hours. Three weeks on and no reply to my 3 emails and no refund. Despite all of their initial problems they kept advertising on groupon without fulfilling their obligations to existing customers. I think they are con artists and I would strongly advise everyone to avoid like the plague.