Only caveat: you must know the limitation of the lens
1. the shortest focusing distance is about 50cm - this may pose some problem if you want to photograph your girlfriend across the table. May need to back up to the next table for the shoot risking making your girlfriend feeling jealous because she thought that was the excuse for you to get near to the sexy girl on the next table!
2. 18mm is equal to 28 (1.6x crop) so the angle of field may not be wide enough. May need to back up to get all those food spread on the table, with the dishes coming out too small for you to show off to your friends.
3. at the 'long' end of 55mm (or 88mm on crop) may not be able to take the photo of that pretty lady across the room without the inclusion of distractions from the image of her boyfriend. Need to be thick skin to go nearer (manual zoom) to her for that large enough image. Of course you risk being beaten up by her boyfriend.
So if you know the limitation and work around (and the risk involved), this lens is more than enough
Generally, this lens is adequate for casual photo in city travel. Of course if you intend to photography wildlife in safari, that's a different story.