I purchased my first N900 in June 2012 and fell in love instantly. So much so that I am now a proud owner of four of them (one partly working, for spares).

I have recently acquired a used N9. Everything works except for the loudspeaker, which is the main reason I have not yet tried it as my daily phone (since I can't hear the ringing; although the earpiece works so I can hear the other party speaking).

I do not use any social cr@p so cannot give you any feedback in that area. Neither do I know what Tinder is. The phone comes with everything I need from a smartphone right out of the box. Being second-hand, mine even came with a lot of stuff preinstalled that I do not need (like games), so off it went, saving about 500 MB.

I paid about 80 GBP delivered which I think is a fair price for a 64 GB N9 in the given condition. It would have cost me about 1/3 less if I lived in the US: the shipping from the US plus "import charges" imposed by eBay pushed the price up.

Please bear in mind that the following is written from the point of view of a die-hard N900 user. YMMV if you come from a different camp.

First off, it was not an instant love like the N900. The N9 actually looks and feels more like a phone than the N900 does and I can imagine using it as my main phone if i get the speaker fixed, but I am not sure I would spend nights on it like I do with my N900. It feels like a damn fine device but lacks a certain 'mojo' compared to the N900.

Things I like about the N9:

• Starting from the basics - the form factor. It feels just right. The dimensions, the screen size and resolution, the weight, it all feels Just Right™.
• The screen. The OLED screen is so crisp, I've never seen anything like it. And I love the always visible clock on the stadby screen.
• The speed. Everything is instant, unlike on my N900 which shows some lag in some operations. I have not yet noticed any lag on the N9.
• The battery life. As mentioned above, I have not yet put it to a serious test, but a basic like switched on, connected to GSM and WiFi, checking regularly for emails but otherwise idle, the battery lasted about 5 days. My N900 in the same situation barely makes it through two days.
• The user interface. It took about half a day to get used to and I still miss the X button to close apps, but I am getting more familiar with it and I definitely consider it far superior to any Android offering (that I've seen so far).

Things I am not so keen on:

• The capacitive touch screen. Yes! I seriously miss the ability to use the fingernail or the stylus to pinpoint exactly the point on the screen. Using your finger on a busy website is only asking for trouble.
• The lack of a physical keyboard. This is by far the most serious drawback. Shift+Ctrl+Left/Right cursor in a text editor to highlight some text is merely a dream. Which means I had to type my WiFi password manually rather than copy&paste. Quite a drag considering that my password is a random string containing both case letters, numbers and special characters.
• The lack of a memory card expansion. Not that it bothers me yet, but it might get there at some point.
• The micro-SIM slot. I find that annoying because it means I cannot freely swap SIM cards between my devices.

To summarise and answer the OP's question, yes, for the price I've paid for mine it's definitely worth it