I've gone through a few different brands over the years. Kinda settled on 2, but for different reasons. I'll slo say there's no point in doing it if tour going to be using the item pretty quickly, as the bags and rolls are pretty expensive compared to normal freezer bags.
Anyway, I was gifted a food saver brand many years ago. Worked ok for home use. (Bulk meat buying, long term dry goods storage) when hunting season came around I took it over to my dad's place. (Where my family does all the butchering) and it lasted about 2 seasons. The vacuum pump died in it. So we got another and it lasted a few years then died as well.
The last time we split a cabelas 14" stainless steel "commercial" model. It was just shy of $500.00 when we bought it. (Was split 7 ways so not bad priced for anyone of us.) It's been working great for many years. Processed countless pounds of meat with it. Has a replaceable heating element and I'd swear it does a better job then the smaller food saver models we had before. Only downside is we agreed it would stay at my mom and dad's place. So I bought, another food saver for my house and thats held up fine for occasional use. (Couldn't justify the cost of a commercial unit.)
One of the best things we recently bought was a good dehydrator. That and the vacuum sealer are worth their weight in gold.
Few things we've learned over the years, some shelf stable products need an oxygen absorber tossed in the bag, and other things could use a desiccant pack tossed in the bag. Somewhere my wife has a list of what you should toss in with specific products.
Buy good quality bags with the channels in them, they seal up better in my experience.
I prefer to get the material on a roll vs buying pre-made bags, it's cheaper and let's you make specific sizes to suit your needs
I haven't had great luck with the vac-u-seal jars. May just be me doing something wrong.