The 0.6db refers to the noise figure on the LNB Howard, whether it be enhanced, Universa, Tri-band or otherl, with this figure lower is better but as discussed on previous threads, you can pay a lot of money for an LNB with a "supposedly" very low noise figure, but gain very little improvement.
The term Universal applies to the frequency coverage, the old Enhanced LNB had a Local Oscillator of 9.75 Ghz, so would down convert by that amount, the Universal has two Local Oscillators (down convertors), one at 9.75 Ghz and one at 10.6 Ghz and by the use of tone switching can therefor cover a wider frequency band.
Its the frequency range where most of the satellite channels which we view are transmitted, there is another much lower frequency range called C band and then another called Ka band, the later I believe is used mainly for commercial applications, but I don't know much about it.
Yes Howard, for viewing the full range of Ku band digital signals you need a Universal LNB.
I still use a full band (9.75 and 10.75 GHz) LNB configured with a polariser that has ajustable skew settings via a 3 wire pulse system, connected to a 3.7m dish (soon to magically 'grow' to a 4.5m)
The adjustment of the LNB can be critical to getting or missing certain channels on satellite, especially feeds where the signal is sent as a low symbol rate or has low FEC
For the majority a universal will do the trick, but the noise figure is lied about by all but a few brands. Money keeps them in business, they will lie all the way to court if they have your cash in their wallet.