I've never used omax close-ups, but they seem to be good for TLRs, as they have parallax correction, and they come with attachments for both the viewing and taking lens, making it very convenient.
I don't take a lot of close-ups (lazy), as the close-up filters I have are series 5, using an adapter. Problem is, they don't come in a set for the viewing and taking lens, and I need to adjust the camera height after composing. But they are cheap. Ebay vendors sell the adapters/close-up filters from SGD7 onwards each.