I have had several Theory items over the years and they have always been lovely and lovely quality, Peri. However, I agree entirely with what Angie said. Yes, they are worth the price in that they are very good quality and they are very stylish, while also often somehow being timeless. As Angie was pointing out, that doesn't mean that they will be worth the price, i.e., a good value for you. You are a necessary part of the calculation! Your needs will determine whether they are worth the price for you.
My calculation goes like this: I prefer wool suiting to other fibers. I wear wool suiting (as a suit or as pieces) nearly every work day. I wear wool through the winter and summer, so unlined wool is my preference. My climate allows me to wear unlined wool in the winter and summer. Dry cleaning is not an issue for me. I am able to give my wool suiting a break of a couple days to regain its shape and air. (Wool is naturally antibacterial, so sweat is neutralized slightly by it as it airs. Therefore wearing it every few days refreshes it and means less dry cleaning.) The feeling of wool against my skin does not bother me. Because I wear my suiting so often, I can buy styles that will have a shorter style duration (two or three years). My style is generally very clean and classic, so investing in pieces that are clean and classic but with a bit of an edge suits my style. Theory is cut fairly well for my body shape. Those things make Theory suiting a good value for me.
Your needs may be very different than mine. In that case, it may change the equation. I probably didn't even list some of the items that may be relevant to you! At the end of the day, whether Theory pants are a good value for you depends on YOU!