Recommended, and not just because I am a member. I joined my local club late last year and wish I had done so sooner.
In general you will find the most supportive people, all with the same goal. All the "regular" clubs (with a few exceptions - check their web sites, start at toastmasters.org) allow guests to attend without pressure to speak or join. Many do join.
Upon joining you will be offered a mentor - generally a more experienced speaker who volunteers his/her help and guidance. You'll also get a manual with 10 speaking projects, each of which focuses on a particular aspect of speaking: structure, body language, vocal variety, research, persuade, motivate. You'll progress at your own pace.
In short, you can expect a positive, supportive environment where you are encouraged to develop as a speaker. IMHO, well worth the time and money.