I think Bidsketch would work well for any small business or freelancer looking for a low-cost, simple to use proposal software solution. It's quick and easy to set up and provides everything you need for more cases. If you're looking for something with more flexibility or features that Bidsketch does not offer then you may need to keep looking.
SharperAx is great for a larger, distributed sales team with lots of messaging and content. It does not seem as appropriate for a commodity product which is mostly price driven.
REALLY PRICEY for a small business/freelancer that doesn't do a lot of proposals each month. Would be nice if they offered a per proposal pricing for the smaller guys.
Wish there was more customization of the design/layout to better fit in with branding.
Also would like to be able to mark a proposal private.
I'd say Bidsketch is very easy to use. I don't think most people would have any problem getting comfortable with this software. I was able to get up and running very quickly. Their template library is a great resource to get a professional proposal up and out the door fast.
Although I didn't need to reach out to support much, they seemed to do a very good job. I've also heard great things about the team through people I've talked to so I wouldn't expect anyone to run into issues with regards to their support. Their support definitely was not a factor in my ultimately not sticking with the product.
We used DocSend to track our outgoing proposals but after testing Bidsketch we never returned back. It is simply better suited for us as we send out tens of proposals every week and the professional output and management of proposals won us over.