I have a pair of 350s and 450s in my living room. The 450s are used for the mains and the 350s are used as the surrounds.

For bookshelf speakers, they’re fairly good. Just keep in mind what they are and not what Def Tech tries to make them out to be. They work well as long as the signal is clean (IE: Yamaha/Denon class, or better) and the amp does not make any kind of serious power. An amp with any kind of decent power can cause the passive subs to bottom out causing a really irritating (and embarrassing if guests are over) rattling sound. If you run into that situation you’ll have to change your receiver setting to small speakers so that the bass frequencies get routed elsewhere. Or, keep the volume turned down.

Other than the passive sub bottoming out problem, the speakers sound surprisingly good given their size. The sound is clear and linear making them easy to listen to.

Construction is certainly better than most. They have a nice heavy well-constructed feel to them. If you’re going to hang them on a wall, make sure they’re anchored to studs or something else solid. You’ll probably have trouble in time if you rely on just the sheetrock to hold them up.

The cosmetics are great. They have a really clean, very classy look. Top notch and second to none.

All in all, these are pretty good bookshelf speakers when matched with the correct equipment.