I must say I'm impressed. On a side by side comparison the light output is very similar to a 35W Halogen GU10, though a much whiter light than the halogen lamp.
And the important thing (for this application) is this one is exactly the same dimensions as a standard halogen GU10 (some of the higher powered LED's and ccfl GU10's are larger than the halogens so won't fit all fittings)
I'm still glad it's not me needing to buy nearly 100 of these though.