I have the 454's in the PC-R on my temporary 20L and the T5's on the new 40 breeder. I've heard they are comparable to the ATI blue plus that everyone loves, but i've never seen those in real life.
The 454's are a very nice blue color. I think i need to work on my bulb combo in the Tek T5 fixture tho, since the GE bulb kind of washes out the blue, and the actinic bulb hardly does anything... i also haven't moved the nicer corals into that tank yet, so time will tell.