While everyone evaluates their options at this stage in the buying process, how carefully they evaluate their options depends a lot on their personality and the cost of the solution. Generally speaking, the more financially conservative your target audience is and expensive your solution is, the more comparison shopping your potential buyers will do.
Once the prospect is in the proverbial funnel, you've peaked their awareness. That's the first stage of the funnel. However, getting a prospect aware of you is no simple feat. Depending upon how they've arrived to your website (organically or through a paid ad), those customers might view your funnel differently and your opt-in rates will vary significantly.
If you're wondering what a sales funnel is, simply imagine a real-world funnel. At the top of that funnel, some substance is poured in, which filters down towards one finite destination. In sales, something similar occurs. At the top, lots of visitors arrive who may enter your funnel. However, unlike the real-world funnel, not all who enter the sales funnel will reemerge out from the other end.