Do not under any circumstance give a lot of your money up front for a reduced rate. History on here is littered with tales of woe. And that's general advice with no implications on any organisations you may have mentioned.
Robin HR100 - flew one once. Thats it, just the once.
Try to fly as often as possible. I took too long due finances and so spent time de-rustyfying at the start of each lesson.
Apart from that - enjoy.
SGC