Never dealt with that company and without comparing prices against other suppliers it a difficult call to make.
Now a question for you is this, how many panels are you looking for?? whats your budget??
Now TMF has a TMF+ section which is a fiver a year and you then gain access to various discounts we have. 7.5% with Minispares, 10% with M Machine for example.
So the more monies you spend the bigger the savings.