I'm with others in saying that a small, dedicated unit will be "better", but I personally own the Uniden. With a magmount and a 12V cigarette plug, it works great! The only downside is that when you turn the unit off, it reverts to Ch9. I listen to 19, so every time I turn it on, I have to click up 10 channels. Big deal...
Aside from that small gripe, the Uniden has been an excellent little radio. I didn't NEED a handheld when I made my purchase, but it is nice knowing I could go truly mobile with the rubber duck and batteries if I had to. Remember you will need an adapter to go from the small connection at the radio, to the larger fitting on the magmount antenna. Here is the one I purchased.
FireStik AR-3 Coax Adapter, UHF PL-259 to BNC https://www.amazon.com/dp/B00JYHRFUI/ref=cm_sw_r_cp_apa_i_K6jbBbD3WKXKM
On a side note, I did install a small 35W linear amplifier to help "get out" a bit better. I always get excellent copies when I use it, and would recommend it in tandem with the handheld, as I was only getting 2.2W output on my meter when speaking into the radio (swinging). Using it car to car under 1/2 mile should be no issue running the radio barefoot, but it is something to consider.
Hope this information helps!
-Uniden PRO401HH
Uniden PRO401HH 40 Channel Handheld CB Radio https://www.amazon.com/dp/B00N43KM5S/ref=cm_sw_r_cp_apa_i_W3jbBb741Z69J
-K40 K-30 MagMount Antenna
K40 K-30 35" 300 Watts Stainless Steel Magnet Mount CB Antenna https://www.amazon.com/dp/B000H2W270/ref=cm_sw_r_cp_apa_i_U2jbBbVEFPAF4
-RM Italy KL-35 Linear Amplifier