unfortunately from my experience it's rather buggy. It might work fine on some configs, on others it just keeps failing. For some obscure reason it does not appear to get some basic variables like the baseurl and the prefix from the system, and so the frontend becomes pretty much unusable...
Too bad because this is a great extension, maybe not the best looking one (the css needs some love) but the functionality is much better than any other I've tried, especially counting the great frontend module that helps a lot in getting a quick overview of the tasks and projects.

I tried several comment solutions, but I must say, Jom comment is by far the most complete, functional and most visually pleasant solution I've come across! It has good anti-spam protection, the interface is well done and the admin panel is useful and easy to use. It seems also pretty good coded, at least I have not found any real bugs so far. It's a commercial component, but believe me, it's worth the price!

The extension is OK, but not more... lacks an upload function, you have to enter all the data yourself, and on my install it just would not work (saying "no file selected"), which btw. is a problem I've seen on other sites too, with this component.

It's actually the only native forum component out there afaik, so if you don't want to mess with a bridge component to another system like SMF, then you will have to stick with this one. Joomlaboard is not a bad forum system, it's ok for most uses, the basic install looks pretty poor (from the graphics point of view) but that can be easily (at least so it was for me) changed using one of the excellent icon packs out there, I'd suggest the Plazza icon set, it's very clean and professional and comes with several colour variations. For the rest it works pretty much like any other forum.
There's a couple of issues though that made me often wonder if I should not have chosen another solution in the first place. For example the read and unread icons don't always work as they should, i hoped for this to get better with updates, but it just got worse, I have 1.1.4 and most of the treads I have not read yet show up as read, only my own answers have the unread icon (and it won't go away either, not even after repeatedly opening the thread). Another problem I had was that upgrade to version 1.1.4 broke the well working integration with Community Builder. Integration still works but access rights to forums depending on the user level don't work anymore. If a forum is set to be visible and usable only by users with level author or higher, this forum will be visible only to authors ignoring the "include child groups" option so that for example publishers won't see the forum.
Support on the TSMF forum is also not very good, often help requests are left unanswered, so you'll have to figure out things on your own once you have problems.
Apart from this it's certainly a component that can work fine, and it has the big advantage to be easily installable and perfectly integrated into Joomla.

The istallation is OK, just read the readme.txt. unfortunately the whole thing does not work as good as it should.
first: you have to manually copy all the orange phpBB icons into /modules/mod_sbicons (the ones in the mod zip), since installation won't copy them.
second: the colour alternatives suck, don't match the orange phpBB icons and since they just replace just some of them it looks like an inconsistent mass of random icons, and spacing looks horrible (will have to edit some php files to get that right I suppose).
third: some icons just don't show up... the save to pdf icon is one and the rules icon is another one, had to edit the mod_sbicons.php file to solve that (adding the line $sbIcons['rules'] ='drules.png';) ... though I could only solve it partially... the rules icon still does not want to show up the post-editing page.
fourth: another inconsistency problem, the new post icon applies only to the subforums, but not to the home of the Board.

all in all I'd say it's a nice touch to the forum one you get everything running... but it is kind of like making it yourself... don't see the point of distributing a package at an early stage like this... needs some polish. but maybe it's just not working on my install of Joomla.