Being someone who lost alot at a "reputable" school I would advise DO NOT DO IT.. Any school that wants payment up front as is not wishing to accept installments should be avoided.. saying that I did pay for my ATPL groundschool all in one go.. but that was at London Guildhall University.. and with my educational experience was sure that they would be in business for the following 8 months at least..
Be wary.. if you lose it you will NEVER get it back.
Spitty