MSTIELAU  I liked this app a lot. But it seems to have stopped working after I installed Snow Leopard. Here's hoping that the developer continues to update this nice application.  
(Version 1.2.1)

MARK NELSON  The application allowed me to find the pest placement of my wireless router. however it did keep unexpectedly quitting on me.  
(Version 1.2.1)

DAVIDSAN  I do not know what is happening with this app.

It crashes a lot on MacBook Pro 17 inch 2.16 with 10.5.6. I mean a lot!  
(Version 1.2.1)

MOLLY  I prefer to use AirGrab WiFi Radar.I haven`t problem with it.  
(Version 1.2.1)

SLIPPYSLOPE  I learned of AP Grapher on the Apple Discussion board dealing with the MacBook Pro dropping Wi-Fi connections. Grapher is a great way to track connectivity and confirm that there is a 'drop' even though the Mac 'Radar' says there is a strong connection. Grapher worked perfectly right from the getgo on my MBP Intel Core Duo 2.16 GHz running 10.5.2 (and now I have the evidence that the MPB is dropping the connection). Thanks.  
(Version 1.2.1)

ICELAND_GYRFALCON  Excellent.

I like the 'hide inactive stations' and 'hide secure stations' options.  
(Version 1.1)

ISLANDMACMAN  Same here on a MBPC2D

It does look nice though - can't wait for an update!  
(Version 1.0)

IVANOVITCH  Doesn't work with MacBook Pro Core 2 Duo - probably needs updating to cope with 802.11n cards that appear in these machines.  
(Version 0.5.3)

RYAN  This is very useful for trying to find out the coverage of your wireless router. I used this at my church for figuring out where our WiFi "dead spots" were, and where the card tends to switch from one hot spot to another (since we have three to cover the entire building).

It's also very useful in tandem with KisMac, having KisMac automatically connect to any open network while wardriving. Leave both windows open so you can see both easily, and you can use AP Grapher to get in a good position for best reception.

Note to those who asked about certain features not graphing (like noise, signal, etc): Those depend on your computer and wireless card. Certain AP cards will not provide data for those features, some will. I don't know off the top of my head which ones do what, but at least you can know why. :)  
(Version 0.5.3)

EMPEREUR  I had the older version, great small product, thanks, recommend to everyone.  
(Version 0.5.3)

HYPERSEEKER  I have come to like the simple interface of AP Grapher vs iStumbler's. But, the signal and noise graphs have never shown up. I have only get to see the Link Quality and Comm Quality.

Any comments on that?  
(Version 0.5.3)

TG  AP Grapher helped me in comparing my ADSL WiFi router settings. Changing from channel 11 to 10 leads (for my config) to a near 10% signal gain.

The graph displays the benefit instantaneously while I change the channel on the fly.

HINT: the editor says that the SW consumes extra CPU when graph reachs the left side of the window as it has to refresh the scrollbar.

Simply set a buffer value less that the window's width an your done with this leak :-)  
(Version 0.5.2)

TG  My PBG4 is running a Belkin F5D7010 54g card and AP Grapher works with it.

Only the quality data are collected; both signal and noise graphs stay at zero.

Even that way, it is worth its stars!  
(Version 0.5.2)

DUANE  Works great! Easy to use for mapping out your base station's wireless coverage.   
(Version 0.5.2)

GIZ  Great SW. Simple, does the job perfectly. Thanks  
(Version 0.5)

JEDIK  Version 0.5 rocks: small, fast, works flawlessly and it's free! Thanks a lot! ;)  
(Version 0.5)

JEDIK  Very good and useful. Just wish it reminds the settings (windows size, position and last settings). It does uses a lot of CPU cycles (can it be improved?), but does the task well and it's free. :)  
(Version 0.3.1)