We bought all new appliances from Tasco about 2 1/2 years ago. At teh time teh service was ok and i was able to negotiate a reasonable deal. We bought the extended (4 year) warranty on pretty much everything - oven, gas cooktop, microwave, dishwasher, fridge, washer and dryer.
We have had issues with our cooktop leaking gas - it was replaced and resinstalled by Tasco within the first six months. About a year later the gas smell had returned. Tasco sent a repair company that wanted to charge us the second he walked in the door, told us we needed extensive work to replace the gas pipes etc. Tasco said they were not responsible and would not pay. After lengthy calls, they were going to get back to me about helping pay for part of it but never did. In the meantime we had a licensed plumber friend come and check it out. He tested everything tightened one spot and said nothing had to be replaced. It has been several months now without any gas smell.
Tasco only uses the one company to service gas cooktops - clearly they are not above board and try to charge for work that is not necessary.
Long story short - Tasco does everything to get you to buy there, but when it comes to service after you are on your own - even if you have purchased the extended warranties.