to 1.8 or not to 1.8

ive just got hold of a new set of panaracer xc pro 1.8 tyres and im toying with the idea of putting them on my bike and replacing the scott ones i got with the bike 2.1s. what do you reckon or has anyone used these before.
2010 Forme Reve
2010 Giant Talon 1
2010 Giant Talon 1
0
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They're alright, nice and quick, good on dry hardpack especially.
Might be good in the mud, can't remember - but I know 2.1 XC Pros clog-up badly, so maybe not.
You won't know until you try though.
2012 Wilier Cento Uno:
http://www.pinkbike.com/photo/7134480/
Commute bike: http://www.pinkbike.com/photo/9065383/
Had them on a previous hardtail.