Don't have a TR6, but I like them on my TR3/A & Stags.
They aren't "magic bullets" though, so you still need to be careful to inspect and install them properly; and be sure to never strain them. The stainless braid is only to protect the relatively soft actual pressure line inside from abrasion, and will hide any damage to it. If you accidentally drop a caliper and the line catches it, it's probably best to just replace the line. Some people say they should be replaced periodically anyway.
Nothing wrong with doing only the fronts, but you'll only get half of the already slight improvement.