Pros: La calidad es bastante buena, tanto el cable como la antena en si esta hecha de unos materiales muy robustos y resistentes, ademas lleva en la base un iman que se acopla perfectamente a la superficie de tu coche evitando que se deslice y caiga al suelo

Cons: En vez de dar mayor cobertura, es justo lo contrario, me explico, tu vas con tu GPS Bluetohh ni mas tranquilo, cuando de repente ves que baja una rayita de la cobertura y dices, ajaaa! ahora es el momento de probar la antena esta que me compre! la nchufas con toda la ilusion del mundo y te das cuenta que de repente bajan todas las rayitas al minimo, por lo que en vez de ayudar, impide la cobertura

Other Thoughts: nada mas

Bottomline: Otro de mis trastos que llevo en el coche, quiza me sirva algun dia el cablecito para hacer algo tipo McGiver

Pros: Fits perfect in a Navtour G4 external antenna port.
Long cable allows convenient placement anywhere in the vehicle.
Priced lower than anything else I could find.
Black in color

Cons: Black may not blend in with all vehicle interiors.
It is a friction fit (standard for this connector type) I do not know how this will hold up long term. Otherwise, none that I can see (yet).

Other Thoughts: It just works!!
I was previously unable to get a signal inside my house. After installing this antenna, I can receive 8/9 satellites.

Bottomline: An excellent buy if you can verify compatibility BEFORE you buy.

Pros: The antenna is sturdy;
The cable is quite long, which can be useful for hiding your equipment behind the dashboard;
The top is magnetic so it sticks on/under the hood;

Cons: The connector is quite small and sometimes lets loose when its relocated, but when not moved it stays connected;
The reception is not perfect, but TomTom always shows 4/5-5/5 satellites, which is near the max.

Other Thoughts: The connector does not fit on a HOLUX GR-230, the connector on this antenna is quite small.

Bottomline: Get this antenna if you want a cheap antenna to get better and a more stable reception.

Pros: This receiver boosted my GPS signal wonderfully!
My GPS unit (Harmon/Kardon GPS-300) couldn't get a signal inside my car due to the glass. Plugged in this antenna and it gets a great signal now, even with the antenna simply sitting on the dash.
Didn't need to mount outside the car!

Cons: There is only a sticker covering the metallic magnet on the bottom of the unit, and it isn't applied evenly - would wonder if it would scratch exterior car paint.
It is very difficult to remove from the unit - it takes a lot of force. There's basically a metallic o-ring on this mmcx connector that secures the antenna into the gps unit. While it makes a good ticket connection, I worry about breaking the cable or doing damage to the gps unit when removing it.

Other Thoughts: The supplied cord is pretty long - this could be a plus if you do need to mount it outside, but sitting coiled on my dash, it's kind of unwieldy.
I thought the solar glass in my car and van (both toyotas) would completely block all gps signals, but it turns out the built in receiver in my unit must just not be strong enough. With this antenna it picks up many sattelites, each with a decent signal strength and the gps reports "high" accuracy.

Bottomline: You won't find a better price on an mmcx gps antenna - most run around $20-30.