Summary: I've been looking at car stereos for quite a while. wanted one as versatile as possible. This one caught my eye, and after researching it, both on and off e-bay, decided this was the one I wanted. Because it has the built-in SD Card Slot and USB port, not just a mini-plug like most, this gives me greater ability to keep my music "on-board" and not worry about losing it. Plus the ability to play almost any CD format adds to the value.
Summary: This unit is wonderfully powerful with an awsome array of features. Especially love the integrated Bluetooth. Phone calls work very well with no need to turn down the radio while answering the call. One of the main reasons for the upgrade was to get something that would play more than just CDs. I did not like changing disks constantly. I did not realize until we received the unit that it could play SD chips.
Summary: I bought this unit after looking over a number of different brands. Had not heard of this brand but did some research and found that Boss Audio has been around for years. It is a very empressive unit with lots of features. I particularly like the bluetooth feature built in to the unit. It was an easy set up and works great with my phone, completely "hands free". Also liked the wattage rating which was the highest I've seen at 80 watts per channel.
Summary: This unit is mounted in an external bay on an RV. The bay is dedicated to TV and audio. The unit drives 4 Polk Audio speakers and powers a dedicated bass amplifier driving dual 12" Kickers. The sound is clear, crisp and deep. From Tailgating (sports casting) to listening to music with friends this setup gets alot of attention and plenty of compliments. The Boss Audio 648bi has proven to be the solid foundation I was looking for to attain and enjoy great audio.
Pros: Attractive Design, Easy Controls, Easy To Install, Ipod interface, Multiple output options, Nice Features, Plenty of features, USB and Bluetooth
Summary: I am very satisfied with my Boss Audio 648bi. I called customer support several times and received quick direct answers. Is is probably difficult to find a radio with all those features especially at the current low price. Some caveats, however. The case might be a bit longer than other radios. This can be crucial in some cars because there are extra wires in the back of the unit to attach auxiliary devices and an ipod.
Summary: This thing sounds almost as good as my $500 Nakamichi. It's like sitting at a live concert, I can even hear the wires on the bottoms of the snares. I bought it for the Bluetooth, which works okay, but I didn't expect it to sound so good. I knew that stereo that came with my Nissan was average, but I didn't realize how bad it was or how muddy my songs sounded until I put this in. And it even has a place for an SD memory card so you can record stuff from the radio or CDs.
Pros: Attractive Design, Easy To Install, Nice Features
Summary: I installed this deck in my high performance boat. I had a Sony and Kenwood in there before and in even minimal chop a CD skipped all over the place on both decks. The BOSS is fantastic and the ESP really works. I've been in constant wind chop and flown over 2 foot wakes and not a single note was missed. I am thrilled with this units performance.
Pros: Attractive Design, Easy Controls, Easy To Install, ESP WORKS, Nice Features
Summary: This is a great multifunctional receiver. I purchased it as an upgrade to my existing system and I am very impressed with both its sound quality and functionality. It allows for connection of a number of music sources from iPod to USB and as for sound, it seems to have boosted the performance of my amplifiers. The various controls take a bit of getting use to and are not particularly intuitive but they have packed quite a lot into one package.
Summary: The bluetooth functionality works well in my vintage 96 Olds Cutlass 2-dr and the microphone is quite sensitive, working best if the front speakers are turned down while talking to avoid feedback. You don't have to shout at all to be heard on the other end. The first unit I received was defective in that the FM tuning was very poor. The 2nd unit I exchanged for after discussing with Boss Audio Techies gave good reception.