ti's are heavier than normal. i have px12jib TI. TI means titanium so there's metal in the binding (heavier, but more durable), compared to normal which is all plastic, no metal --> lighter but less durable
all it really does is protect your ski from the binding. topsheet flexing across a sharp, flat, unflexible steel surface is not very good for your topsheet, or resale value... therefore, translating to the word "bad".