Excerpt: I use the 1 degree spotmeter in conjunction with the Sekonic flash meter. I believe to be very accurate, but it's clumsy having to switch devices between incident, reflective, and spot metering.
Excerpt: I do cinematography work and this spot attachment worked great. The only problem is the attachment is very large and becomes a burden. If the size does not bother you then the attachment works very well.
Excerpt: Use it to get reflected light readings for outdoor shots. Has really helped speed up the whole process of obtaining exposure. I don't know if this is possible, but it would be great if the angle of light it receives could be adjustable like a zoom. I also use it when setting flash ratios indoors.