Found the New Agent a little awkward for my eyes as it uses a rectangular trench groove which seems to be cut at 2 different widths, one slightly wider than the other, before and after the ejection port. Also the beavertail is the old style, not contoured (streamlined) for a more comfortable fit. Went with a Kimber RCP II, which also uses a trench sight, but it is a rounded groove, which works better for me, plus a more comfortable beavertail and rounded heel grip. Also have an AMT groove sight Backup 45. And have shot an early ww1 era (1915) Walther M4, which uses a v-trench groove sight.
"Is it hard to get used to not having traditional sights? What kind of accuracy do you get at 15-20 feet?" [ulfyer]
Its pretty easy to pick up, remember you are not shooting at 150 feet here. Accuracy at close range... expect a 1" group. Pictured below is the smallest current production 45, the AMT, rapid fire, and that group is 1". The AMT is a heavy trigger DAO, the SA micro 1911s are much easier to get on target.
"There are a variety of other 9mm compacts in 1911 style..." [Ibid] True enough, but there are a lot more manufacturers building small non-1911 9mms, so the options can go up and the prices down.
The huge advantage of the groove/trench sight 1911 is that it carries so well, the lack of traditional sights means a no snag quicker draw.
http://www.thehighroad.org/attachment.php?attachmentid=200080&d=1403808943