I got one of these on fleabay for a tad over £90 and it is dead easy to fit, even a Halfords muppet can do it. We replaced the Peugeot 106 stock unit, absolutely cra*!, (but suprisingly good sound quality) , with this unit only needing a ISO loom connector from autoleads. The microphone is just behind the panel so you dont have to run a microphone behind the dash and the headlining.
Bluetooth: - When first fired up, it is easy to pair to a bluetooth phone. We have an array of Nokias in the family and the wife's one is a 6111. This paired instantly and up and running in no time. It appears in the paired device as 'xplod' and off you go. It will pair up to more than one phone, and it will do it instantly as soon as you turn the stereo on, good news there. The main issue is that if you finish using one phone , then get in the car with another phone , you have to connect the new phone , despite it all ready being paired. A slight annoyance, and very minor. The best feature by far is that the unit uses A2DP. This allows you to play music from your phone over bluetooth in CD quality stereo. Not all phones can do this , but some can with firmware updates. The quality in call (and ours is a diesel, so very noisy) is very impressive considering it isnt a noise cancelling microphone, or directed right at head height.
CD/MP3/WMA: - Havent done WMA tracks yet, but MP3 sound quality is awesome, for a budget unit, and it has various equalizer settings and also custom that lets you set bass/treble. I used a Steely Dan album (Gaucho) to test with and my mate said that "they couldn't have been stock speakers" in the little 106. No problems at all and Sony doing their usual greatness.
Display: - Can be very bright, especially on dark country roads at night, and difficult to see when the track ID is scrolling, this can be turned off though.
All in all a superb bit of kit. Only a pedant would give it 4 stars, but you have to look at the price.
My only gripes, and to be fair, they are only minor and I should have bought the vastly more expensive one BT5000 if this really mattered, is the lack of pre-outs for amplifiers etc, or IPOD input etc. It does have a 3.5mm jack AUX input , but frankly if they update this model it should be a USB job next time. This is only a budget stereo and the missus loves it.
I like it so much for the money , my Volvo 850 estate is due one at Christmas, and I wouldn't hesitate to recommend it, and believe me I spent a lot of time looking for a good quality stereo that does everything.