Honestly, I've never heard of any professional shop installing Bulldog products---they're mainly sold at wholesale clubs and mass-merchandisers, and even come with the video for do-it-yourself installation.
I've installed one Bulldog remote start; I think the customer had gotten it as a gift or something. It had its strong and weak points:
-It was very installer-friendly, which you'd expect for a DIY product.
-It has ouboard relays, which makes installation more time-consuming. On the other hand, though, it is easy for the installer to make modifications to the relay pack for certain applications. And I guess this means you could easily replace a broken relay---but I've only seen two relays fail, ever.
-The brain and remote looked a little cheaply made.
-The "antenna" was just a long piece of wire---it's hard to keep it straight for good reception, and even then, the range is lousy since it's buried under the dash somewhere.
-You only get one remote---this is unacceptable for most customers.
-The unit had negative parking lights only---you'd need a relay to do positive lights.
Where I work, we use Audiovox products. Honestly, they're the most installer-friendly units I've ever worked with, are fairly inexpensive, and are very reliable.
They have onboard relays for ease of installation, and also have plenty of extra outputs that should enable you to install them in almost any vehicle. There's an onboard parking light relay, which the installer can easily set up as negative or positive. The hood pinswitches come with nice brackets that make them easy to install. The antenna sticks to the windshield, with a separate cable going to the brain---this makes for better range.
Since I'm just an installer, I don't know much about dealer involvement----but I've never seen a rep visit us from ANY alarm/remote start manufacturer, even when I was with Best Buy or Circuit City.
You also might consider Directed (DEI) products. In my opinion, they are a bit overpriced, and are awkward to install---they have offboard relays like the Bulldog, and I think there are just too many wires running all over, and it's a challenge to make the installation look neat. And their least-expensive unit comes only with negative parking light output, and only one remote. On the other hand, they're probably the most reliable things made, and their tech support is better than most.