I cannot speak for TheoXD and I would not go as far as calling it complete garbage but, at least to anyone coming from the N900, Jolla definitely looks and feels like a toy.

TOHKBD2 is nice but it does not quite reproduce the N900 experience. The balance is wrong, for the starters. Too top heavy. It is also a bit on the big side (the whole Jolla, that is, not just the keyboard). On the positive side, TOHKBD2 has more buttons and resembles a real keyboard a bit more closely.

There are other issues that put Jolla in the toy category compared to the N900. Like the overall build quality and the quality of individual components (e.g. the camera). The lack of the FM radio (both RX and TX) and IR is seriously felt by at least some users. The sortiment of available apps for the N900 cannot compete with major platforms and yet it was much better 2 years after the release than Jolla's. Last but not least, developing for and on the N900 is a breeze compared to Jolla. I could find some 5 years old Qt source, copy it to my N900, type qmake and make and hey presto, it worked straight out of the box. Doing the same on a Jolla is a never ending struggle.