If you can't avoid then be very careful
Well, they do have the cheapest deals but...here's my story:
I ordered a filter on Thursday - though I paid through Amazon (just to protect my self). Kept checking my email & their website for any tracking or order progress but nothing. Tried to call the toll-free number on the site but no answer. Finally on Saturday, I gave up on them & requested a cancellation via Amazon & placed an order through reliable Amazon. I did however receive an email relating to the cancelation request on Wednesday, the following week. Finally talked to a customer service person, after digging through the cancelation policy page. They claim they won't refund the shipping but the item cost. Their shipping is a little over 11 bucks (1/3 the cost if my filter). What's sad though is the manager claimed that if their website did not update the shipping info, it's too bad since they are not UPS & I should have been patient, awaiting my package's arrival.