Had GutterFilter install filters in 2005 - original work was excellent and until this year we have had no problems with our gutters. However, recent storms have had water running over the sides of the gutters on the west side of the house, indicating a possible problem. Attempts to contact the company (3 phones calls and 2 e-mails) have proven useless as they obviously have no intention of honouring their 20 year warranty. Customer service stinks when problems arise. Definitely not happy with this company and would hesitate to refer them given current problems.