The reason why kits and local installers have poor support is margin, there is a lot of competition so they cut costs - and support suffers. Any that might have had good support were driven out of business.
Sol-Ark and Enphase both have excellent customer support... but they're not kits. Enphase installers are everywhere (or you can do it yourself, see
Enphase University) but are typically overpriced and local installer service is usually poor (but you never know, check referals - the ones I went with turned out to be a peach). Sol-Ark doesn't have installers, so it's just DIY.
If you think customer support is important (and it is), I'd say that a good monitoring/logging system is even more vital (Enphase is the best I know of, but it's what I have and I'm not familiar with others). Sol-Ark doesn't have monitoring. SMA/Outback/Victron might be good). Some have 3rd party monitoring. Some allow you to build your own if you're a software enthusiast.
DIY is not rocket science and you can DIY or partial DIY (e.g., hire folks for the bit you don't understand, e.g., an electrician to do the final hookup to live power or aren't physically capable of (e.g., hauling panels to the roof)). Folks on the forum can provide a lot of help if you decide to go DIY.
Microinverters (e.g., Enphase, Sol-Ark, Generac) make it really simple for the roof wiring, safety, and expansion. But if you want battery hook-up they get pricier than string inverters.
Hope that's of some help, my signature below has some links you might find useful. If you post the nearest city/state and the maximum kw (this is maximum draw rate, like how fast a car will go) you use and how many kwh/d (this is like how many gallons of gas of your generators consume per day, if you have a power bill they typically tell you for the month) you consume, then I or someone can let you know how many solar panels you'll need (there are also tools like
SAM that are invaluable)
