What was the best part about using Smartsheet?
Smartsheet is a tool that's quite good at dealing with your company's tables and sheets (made in Excel, for example). I find this particular software to be quite decent, although, I am not satisfied with what I was offered in terms of their services. Smartsheet is a powerful tool, but some aspects are just not functioning properly, and you can find more about that in the paragraph below (other reviewers here have also shared similar experiences).
What would you change about your experience with Smartsheet?
The first bug I found while using Smartsheet is that you cannot assign one task to multiple people at the same time. Smartsheet itself is a very limited platform, and it's not really the designers' fault - everything is just based on spreadsheets, so the software itself is not good-looking, and the design has numerous limitations. The integration with Salesforce is much more limited than what I expected - and this in particular makes the expensive monthly fee expensive. That's all, I guess.
Overall Feedback
Smartsheet is quite a powerful tool, and it's not just for project management. I've seen everything they have in offer, but although I haven't had the chance to try everything there is, I can still say that their services, as far as project management is concerned, are satisfactory (with limitations here and there), and I encourage you to try it, but I would just like to point out that you can actually find quite a number of better alternatives to Smartsheet.