PAR16 4W amongst filament bulbs

I bought a 4W SES spot (36-4237) for a friend to try at his train-station coffee stall, where it replaces a 40W incandescent. It seems a very similar level of available (cool) light, on 10% the power! At ~8h/day use I think it may be saving him about £1/month as of mid 2011, and though not all 10 of the positions are ripe for LED replacements (eg due to the steam belching from his fancy Italian coffee machine, where instead we have tried halogen bulbs at a 30% or ~30p/month saving) several of them are. They'd pay for themselves in electricity alone in 18 months, and maybe again in replacement incandescent bulbs in its 20-times-longer life (ie 20000h vs 1000h for the incandescent), never mind avoiding the fiddle and annoyance of replacing the bulbs.

(As to reliability: all the other non-CFL non-halogen low-energy bulbs we tried, ie CFLs, were too fragile one way or another and failed fairly quickly in the moderately harsh environment ie significant cold/heat, steam, etc.)

We replaced a second incandescent with one of these LED lamps ~July 2012, and he's happy with it.