i have the plx wireless one, M500. Works really good. Its a nice tool to have. I chose that one over the lm1 because i wanted a permant mount, and have a large display at all times. The lm1 runs on battery/cable, and is large. Also i wanted to log MAF, TPS, Wideband....rpm, stuff like that. If you wanted to do that, the lm1 comes to a price of $450. And i paid $509 for an in dash set-up, with wireless. Good product and it calibrates itself at each start-up unlike the lm1. Here are the things that plx doesn;t tell you though. The item is wireless(datalogger only) and it does datalog. However, you need to run a laptop when you want to record, as it does not store data. You use the laptop to record the info. The logger has 6 inputs, 4 analog and 2 pulse. It does not automatically datalogg wideband. So you need to use one of your analog inputs for that. Other than that, its a great set-up. I've had mine for about a month now.
Dont get thrown off by some of the weak points. Its a datalogger and its meant to work on hundreds of cars. So you'll need to calibrate each input signal so that its accurate as with any logger. I didn;t like how you cant self record and that you need a lap-top, but its not a big deal because the only time i need to log data is when i'm tuning and need to know maf, rpm, stuff like that, and i need the laptop anyways to change my eec.
Here are some pics and screen shots of the logger set-up. You can see i have a air/fuel of about 12:1 at WOT(top portion is a/f, bottom is tps) You can customize it like i did. Good luck on your choice. I'd be happy to help you set-it all up.