KA,
As you may have noticed these types of schemes are not too popular....among the people that have a job already....
Here's my take on it;
You shouldn't have to do it.
There are many more pilots that have made it through hard work and a little luck then pilots that have simply paid for it.
It depends on how old you are. If you're pushing 40's it may very well be worth it. If you're in your 20's then just work your way up.
It's not a solution for everybody but it is for some.
I personally know of a late starter who did a 500hrs package on a A320 and last thing i heard he flew for Emirates. So it did work for him.
I wouldn't do it unless you had a 100% certain job lined up behind it.