I think it's great!!! I love leasing, it's a good teaching experience especially if you are looking to own in the future, it's definitely not as expensive as owning but sometimes can be pretty close depending on the type of lease. It has helped me improve my riding because I can go ride more than once a week!
I think leasing a horse depends entirely on your current situation.
I would highly recommend the experience of leasing before buying a horse. This gives you the whole experience without the long term commitment.
You can see what works and what doesn't.
I have seen so many people rush into buying and finding out owning a horse isn't for them.
Of course, not everyone has the opportunity to lease, but I think if given the option it's a wonderful way to experience horse ownership.
Comparing leasing vs owning is hard to financially. Many owners and leasers have specific agreements.
I have a lease horse and I pay livery, shoes and half the vet bill. I have the luxury of tack and rugs provided for me by his owner.
It all depends really. I didn't have the initial purchase of the horse plus the thousands of extra equipment you need! But I've known some people who have had to buy evert for the lease horse.