Are there some bad or better reflectors? I'm looking for a couple of reflectors. I found some on ebay but it didn't list the brand. I wonder if I should look for a specific brand or certain size.
So, my next question is, for shooting less than three or four people in a frame but most of the time it's one or two person, what size should I look for?
They both have 4x4 size and that will cover a couple of people. Four or more people will require larger goods or moving the smaller ones further back to achieve an even, if not less intense illumination.
What do you think about this kit? For interview and filming, how often do I use other reflector color besides white? Should I spend my money on different size of reflector (or a stand) rather than different color reflector?
Those kits give you a great deal of flexibility. My golds are used a lot more often than I ever thought I would use them. Fantastic for enhancing flesh tone and in conjunction with otherwise 5600K photography.
The diffuser, which is like a poly-silk, is a bit undersized for most work, but on a close-up to ECU, it might just save a shot.
The trick with these is having someone to hold them or a surface where you can lean them and still catch the light properly. Sometimes not the best kit for a one-man show.
The other option is rigid frame systems, with fixed or removable goods. Open-ended scrims (dots, fingers, 12x18, 18x24, 24x36), butterflies and flags (4x4, 6x6) are attached from one point onto a century-stand or combo stand. These will, almost always, stay put and free you to shoot. The drawback is having to carry all that kit.
Also, it seems that there isn't really a cross-over between the two schools on these products. I've always thought that carrying a single and double net in a flexfill form-factor would be a good thing. Also, reflecting fabrics in larger scrim sizes and butterfly sizes would be useful for those of us with very small crews.
Short answer, that kit should be great. What is the next size up and down that they offer?