an led vary rarely fails..but it doesnt cost over £90
there are no moving parts,very minimal power usage so shouldnt really go wrong,the mrt ones are just as reliable and half the cost,as you say,i think thats why they have dropped the price which is great for the consumer.
what i never understood is why,in this age where electronics are getting cheaper and cheaper,does the amb pt double in price over the last few years,its certainly not inflation.