This is a good idea, but it has it's drawbacks. I.E if you get obsessed about it, and try using it every day. Blowing too much/too hard repeatedly can cause harm. But it can be useful. Knowing if you PFTs are down (Pulmonary Function Test) you can then go to the hospital. Instead of going to hospital you can do it at home. The less time in hospital the better. Even if it's for a short time.
It's $219 which isn't actually that bad considering. I doubt the HSE would cover that!!!!
Obviously you need to be able to read a PFT amd know what figures are good in terms of FEV and FEV1% etc. the CF team might bring you up to speed on this, so you can use it at home.
If you have one of these can you let me know, and how do you find it.