A friend treated me to Nicky's Thai for my birthday earlier this fall. We had a reservation and were seated immediately; the service was great considering how busy they were. The food lived up to its reputation, and I especially enjoyed the unique and fun brass serving pots they used for my curry. The portions are very generous -- I think I got about three meals out of the dinner I ordered.
The only drawback for us was the noise and closeness of the tables. I realize that space is at a premium downtown, but our table was literally a foot away from the others around us, and the background noise eliminated the option of conversation. We did go on a Friday night, so I would assume that this is not always the case. I would definitely return, but probably for lunch rather than dinner.