Lextensions

Hello everyone and thanks for reading my topic. I have been using Lectora 9 build 5824 for a couple months now and just found the existence of Lextensions. I looked through them all and find allot of them could be very useful, but are there other ways of achieving what they offer? Are they worth buying? Can you use allot of them at the same time in one course? Any advice or information on these would be greatly appreciated. Their forum and other available resources do not answer many, if any questions.Thanks