For the last few years, I've used a HSA to the maximum amount and it has saved me about $1,000 per year in taxes.
However, I have not dropped my regular PPO health coverage. The HSA was just to cover predictable regular medical costs.
My wife and I require several medications on a daily basis. The HSA helped us pay for those medicines on a 'pre-tax' basis and some other annual items like new eyeglasses each year, dental device replacement, etc.
I actually think an HSA is more beneficial for someone with steady known health care costs to supplement traditional PPO/ HMO
coverage than as a way to 'save' on the cost of health insurance.
It is certainly NOT a replacement for traditional health coverage.
One thing I strongly urge anyone is to never drop traditional health coverage.
I've seen too many people do that over the years, and later find that needed coverage is denied under prior existing condition rules.