I'm sure you would have got convinced by now seeing many replies above. These are my 2 cents why you should have it:
1. Vid2Vid promotion - I use for description. Its really worth. Check it out and you will like it.
2. Thumbnail generator. Yes, there are plenty in market, but case in point is seamless integration with your video. It's right there in front of you when you need to create one quickly.
3. Tag explorer. Take it as keyword explorer for your title (as well as tags). I like the competition/traffic indicator.
4. Checklist - Launch Pad feature, which shows the list of things to check yourself before you publish. Of course its a simple To-Do list, but handy.
However, the above are in free version which I'm using so far. Premium version might have better features which I don't know yet. They have discounts for small channels. Check their website.
Finally, whether its safe or not to handover permission to manage your videos to 3rd party, its another discussion. In my view, its better to try in earlier stage of youtube when you have less subs, then trying them at later stage. You won't be confident whether it will break something. But if channel is small, we can take these risks.