My friend insured her rabbit with them and I think you need to double check exactly what they are prepared to pay out. As she understood it she thought she was covered up to £2000, but upon submitting a vets bill for just under £1400, was then told that they will only pay out a maximum of £1000 on each condition, whereas Petplan would have paid her complete bill. Her rabbit was covered for life, but only up to £1000 for the condition. They don't cover dental work either until you have been with them for 2 years, whereas Petplan do, as long as bunny has had a dental in the previous 12 months.
She has now switched to Petplan because she felt she was only actually partly insured and could still end up paying quite a lot out herself.
Just out of interest I got a quote from them which was £11.54 for Dipsy, but who I currently pay £8.56 per month with Petplan.