I bought both my kilns from Potterycrafts and have had them for 11 years with no problems. The larger of the two kilns is very similar spec to the one you have on your link and cost almost the same!. I can't really comment on the service as I just had them delivered and installed by a local electrician and they have worked ever since. I am not a heavy user, firing perhaps 10-20 times a year. It's also worth looking out for discounts, a friend of mine managed to pick up a voucher for me at Hatfield Arts in Clay.
I have solar panels on my house to produce electricity. The excess of which goes into the grid and we get paid for this by the electricity company/government. I always try to run my kiln on a sunny day to reduce the cost as much as possible. My small kiln which is 13kw can run entirely from the solar electricity if it is a nice sunny day.
I once put a small sculpture that was underglazed onto another underglazed piece and it stuck. This happened during the stoneware firing. It did come apart though with a bit of gentle persuasion but I made sure I didn't repeat it.