Hi, mine has been converted to LPG. Would have no hesitation in recommending it, provided you cover enough miles to warrant the initial outlay. Fortunately mine was already converted by the previous owner, so i get all of the benefits. Its a BRC system, which seems to be very well suited to the engine. I have covered comming up 25,000 miles in past two years with no issues at all. LPG is .49p a litre around where i live, and get approx 18-19mpg. So, its the equivalent of nearly 40mpg in petrol terms. The only additional cost of having LPG is an annual gas service to change the filters etc and give it a check over. The only downside, is you loose half the boot. I have a 90 litre tank fitted, but still leaves a fair amount of space, but it gives me in excess of 300 miles range before needing to fill up. Plenty of LPG pumps around, most the BP and Shell now stock it, so no issues in looking for re-fills.
Another benefit is a slight reduction in road fund tax, as dvla class it as an alternative fueled vehicle, provided you send them a copy of the instalation certificate.
Hope that helps.