I absolutely love the Regent, and found their staff to be very warm... The Regent is my go-to choice in Taipei, having stayed there for the last 4 years.

Personally, I don't like the location of W and MO. The W in particular is located adjacent Taipei 101, along with the Hyatt, and didn't quite feel like the 'real' Taipei. Regent's location in the Zhongshan district on the other hand I felt was much nicer, and more 'alive'. This is the same location with The Okura, which I would recommend as well.

One thing about The Regent is that not all room are created same, and thus, the best rooms are found at their Tai Pan floor, whereas the un-renovated rooms can be well, less desirable in comparison. The Tai Pan is essentially a Hotel within a Hotel, and the service was very personalised and the rooms were brilliantly decorated (think modern Japanese).

Also IHG recently purchased Regent Hotels but I would imagine that they haven't actually integrated the brand into IHG, so I think it is unlikely that status will be taken into account at the moment...

Finally, I might also add Hotel Eclat in Xinyi to be a pretty nice option. It is a small, boutique-esque hotel, with rather small rooms though very well thought-out. It's quite gimmicky as a hotel, but I guess it is a pretty fun option being so . This is the same Eclat as the one in Beijing.