What are the advantages and disadvantages of web-based mind mapping?

For now I have some pro’s and cons on online mindmapping tools. Recently I reviewed mind42 and bubbl.us, both free online mindmapping tools.
pro's:
- no software installation,
- platform independent,
- accessibility and availability,
- sharing mindmaps on your blog,
- collaboration via internet such as Google talk & Skype.

cons when you compared online tools to software:
- limitations on functions such as importing and exporting of mindmaps,
- sometimes mindmaps are publically (which can be inconvenient for business uses),
- dependant on internet connection,
- can not extend usage of the tool via plug-ins

Here's my pro's and con's of online mind mapping applications

Pro's:
- Easier to collaborate with other users
- Easier to publish and share mind maps from online tools
- Platform independent, so only one version of the mind mapping tool needs to be developed.

Con's:
- Online mind mapping tools lacks the features of their desktop brethren
- Sometimes you want to work 'off-line' and escape the rat race of the internet
- With some web services closing due to lack of funding and profits, your favourite mind mapping could close down without any notice

I've used just about all the popular online mind mapping tools at one point, but I have always went back to desktop mind mapping tools because of their features, security and ability to work off-line.

I've been a fan of MindManager for a couple years now. I've been using it in conjunction with a MindJet Connect group account. Overall, it's an incredible way to do work.

Pros:
- no software package to install (good for corporate IT)
- multi-user access to a map - can use it as a more structured electronic whiteboard
- great for meetings in which people are located in different locations - ensures that everyone understands action items and agreements
- can run on any platform

Cons:
- off-line access - what do you do when you're on a plane?
- functionality not as robust as PC client apps
- web apps can be slower than PC apps at many functions

The biggest challenge with using on-line applications is security: not necessarily confidentiality, but availability and reliability, i.e, security of supply. This often puts it out of bounds for corporate users. Vendors of online applications rarely offer a service level agreement (such as 99.8% uptime), so you have to be sure that you have got your materials regularly backed up just in case it is not there in the morning. As mentioned above, seamless desktop/online working is also not so easy in many cases. Feature-wise, many of them are where the desktop applications were a couple of years ago, so this aspect will continue to improve.

Can be updated easily : With time, traditional paper maps go out of date as it's pretty time consuming to insert changes in them. As a result, the older ones are discarded and the newer ones with the changes and additions take their place. However, unlike their traditional counterparts, the web maps can be updated easily, making them an ideal tool that you should possess.