If you decide to try something out based on their 30 Day Money Back Guarantee, be warned, their terms state that claims must be submitted within 30 days from the original date of purchase, not from date of delivery. If they have delays in their stock (or presumably in delivery), they will not honour it.

Updated to factor in their response: As detailed above, you did indeed meet the literal definition as supplied in your T&Cs. I am simply warning people that shipping delays due to stock etc does cut down that window.

I have already spoken to your customer service prior to writing this review.