Ryan,
The plan they are on at the moment would be classed as a 'top of the range' plan which ticks all the boxes, but more importantly its at an extremely good price at that level of cover. An equivalent level plan with the other health insurance providers would start at around 3650pa each approx with VHI Plan D.
So, if they were to switch to a cheaper price, they would maybe have to drop certain items of cover, for example, private room in a private hospital.
In order to make choices, a lot would depend on the hospitals that they would be likely to attend based on their location or their previous medical
history and pre-existing health conditions, if any. For example, their current plan fully covers Mater Private and Blackrock Clinic across the board,
so a lower priced plan may not cover every procedure, but would still cover a fair chunk of cover.
The MPF 'premium plan' would look like a very good alternative option at half the cost. Even if one person switches to that plan it would reduce costs significantly, again if it suits. This is at a very good price for a plan with no excess in private hospitals. The nearest equivalent price would be 1530pa each approx with VHI - One Plan Extra.
The main thing is that they understand the difference in cover which may or may not matter that much to them.
In their case, as this plan is not available to everyone on the open market, as its a limited scheme, I would be inclined to get a fee based consultation with a broker that specialises in health insurance. Mainly, from the point of view of explaining to them, what the differences would be in relation to their medical needs and if it would be cost effective overall to downgrade. The broker would also recommend any alternatives if any, that can compete with the ESB plans. When you're spending 4,000 + per year on something, a couple of hundred euro for advice is tiny in comparison and can last years, by pointing you in the right direction.
I have no connection to any health insurance broker, the two prominent ones are Dermot Goode or Patrick Brennan.
http://www.totalhealthcover.ie/
http://irishhealthinsurance.ie/
Regards, Snowyb