"A call at this point is probably wasting my time and theirs."
Most salespeople spend countless hours of time with potential customers who don't purchase - it is certainly worth their time if there is even a slight chance that you will consider the product in the distant future. You are definitely NOT wasting their time.
It's certainly wasting your time... It drives me nuts when I download a trial version of some software tool to evaluate and get phone calls from sales reps before the day is over. Calm down, I haven't had time to even try it yet...
From a customer perspective, ideally that call will help you to save time by:
a) figuring out faster if this software is right for you or not
b) helping you to learn how to use it the best way possible
c) setting this up so you make the most out of your trial.
I'd rather take objection with bad sales calls, not with the fact that they call on the same day.
Most salespeople spend countless hours of time with potential customers who don't purchase - it is certainly worth their time if there is even a slight chance that you will consider the product in the distant future. You are definitely NOT wasting their time.