You should use my plugin "EasyCalcCheck Plus" if you have problems with spam. This plugin was written to stop every spam in Joomla! and supports Easybook Reloaded natively!
More over, There support is second to none. They go the extra mile as often as the possibly can and are always friendly and have never been stumped on a problem.
I'm going to keep using these extensions, becasue simply put, you get what you pay for and these guys are worth it.
There are free extensions out there that do similar, but none as complete and well polished.
Yes it is commercial, and the only downside I see is that it is a yearly subscription for the support and free updates. But for the hassle free useage, it is a small price to pay. Well done guys you rock!
Also the joomla 1.6 version is freel of costs and has always been free??
Joomdle seemed on the face value to be a great idea to have the two integrate together and gain the best of both worlds, and I'm sure that with some people this is the case.
However, if you do not understand what XML-RPC is or are not completely confident in how to find IP addresses or correct URL settings, or struggle to do your own troubleshooting, then this, unfortunately is not the component for you.
The reason being is you will be tearing out your hair if anything goes amiss. The instructions on the joomdle website are quite clear and understandable. But that is about all the support you will get. If, for what ever reason your application does not work, you are then on your own. After going through the forums, and for that matter emailing the developer personally, if you have any issues that he cannot answer, You will probably not get any response at all.
So in summary, Great concept, but if you are not and advanced user and are unable to troubleshoot on the fly. Then look for an alternative