I was new to boating and thought I had done my research. I had another company I will not say who ( I will say they are very well known around the lake) I had them select as my service marina. The first year I scheduled them to winterize the first of October I called every few weeks expecting a bill only to find out they hadn't winterized yet. Finally in mid to late November we got snow and a good cold snap. I called to ask about it and their response was they weren't worried about it. This was on a Thursday and I cancelled their service called Jolene at Big Thunder. She had a service tech on it that Saturday morning in the snow. Since then I have used BT for extensive work from gimbal rings to new waste lines and holding tank. Jolene and Gary have been great to deal with as well as any time I spoke with anyone else. Highly recommend them!