It keeps my batteries topped off and I don&#8217;t have to watch it like a trickle charger so that&#8217;s a real plus. I drive very little so the vehicles sit for weeks between trips. My 1990 Chevy K2500 doesn&#8217;t have much in electronics&#8230; though it does have a slow power drain that I could never find&#8230; so a battery disconnect switch was the best answer. My Ford Expedition is another story so this tender is what it needed. The battery weakens in sub-zero weather so that it does not always start the vehicle and I thought buying a new battery was the way to go. Last time I did so it was a few years ago&#8230; both vehicles take the same size battery&#8230; and it cost about 85 bucks but it&#8217;s now 125 bucks&#8230; ouch! If that&#8217;s all I needed I would give it 5-stars and be done. However, what is supplied with it was not adequate for my needs&#8230; and likely so for many others&#8230; so it gets 3-stars because I had to modify all three cords to make it workable on my two vehicles.I think the best way to use something like this is to have the ability to easily detach it so you can drive off&#8230; like with a block or dipstick heater that have cords that reach the grill so you can just unplug the extension cord. If your vehicles are parked outside near an outlet&#8230; like mine&#8230; this option isn&#8217;t available with what&#8217;s provided with this unit. The Ring Terminal and the Alligator Clamp cords are about 18&#8221; long so if your battery is in the back of the compartment the plug will not reach to the grill. I don&#8217;t like routing it out over the fender and under the hood because you can cut the wire off. The cord from the unit is only 12&#8217; long so that won&#8217;t make it from the outlet inside the garage to the vehicles &#8230; you have to keep this unit out of the weather&#8230; and the extension cord for it is about 11 bucks. Even if it does reach from outlet to battery the connectors are still under the hood so you still have to raise the hood to disconnect it. It also does not come with a cigarette lighter adapter as with some other models. I used some leftover wire I had to make my own extension&#8230; by cutting the 18&#8221; cord and splicing in some wire&#8230; to get the plugs to the grill and that seems to be working fine. I also purchased a cigarette adapter from China for under a buck&#8230; with free shipping&#8230; and added some flat plugs to make my own adapter. Without making my own accessories&#8230; or a purchase of about 20 bucks&#8230; I would have to place the unit under the hood and route an extension cord to it&#8230; and then have to pop the hood to remove it. It seems adding some longer wires to these connectors would not have been all that difficult and well worth paying a few bucks more to get it. There&#8217;s not much in a vehicle that&#8217;s 18&#8221; away from you&#8230; or a 13.5&#8217; when you add the cable from the unit&#8230; when you&#8217;re parked outside. Also, the more cable you add to this the unit the greater the voltage drop and the longer it has to operate to top off the battery. If the cable lengths aren&#8217;t an issue for you, or you don&#8217;t mind spending more money for the extras, then it&#8217;s likely a 5-star unit. I doubt you would need to do anything to make it workable on anything other than a car or truck.