I like it. It's extremely easy and convenient. However, it does have slightly different heat conduction characteristics.
If you've baked bread in metal and glass pans, you'll know what I'm talking about - the bread in the metal pan is more likely to burn and stick but also develops a slightly crispier crust, while the bread in the glass pan won't burn or stick but the crust is softer and less distinct. Silicone bakeware acts like glass, but more so.