I have the Grizzly G0490 Jointer and like it really well. It has been a good performer, has plenty of power, is easy to use, dust collection is good and I have no complaints. I bought it used (Facebook Marketplace) last year for $650. My intent is to add the helical head at some point in time but at the present the standard cutter is working fine (though could use sharpened - which can be done economically locally). My plan is to replace my Dewalt DW735X cutterhead with a helix first when the cutters are eventually worn and then the jointer head.
I can also recommend considering the used option and there can be money to be saved by doing so - allowing the addition of other woodworking gear with the money saved. The caveat is to check the machine over well, though my experience thus far has been more than satisfactory. Another plus to buying used is that you can also eventually sell it at the same or near the price you paid with the original purchaser taking the biggest cost difference when they bought the equipment new.
I can also recommend Grizzly and have quickly become a fan - more than satisfied in every way with their equipment. My first major piece of quality woodworking equipment was the Laguna 18BX bandsaw (purchased new and I really love it) followed by a new Dewalt Planer but since then, I have been fortunate to find great buys on used Grizzly equipment in great condition which has allowed me to fill my shop in a much swifter timeframe than I would have been able to do otherwise. My first was a "new" Grizzly G0548Z Dust Collector ($200) that the seller purchased new but never placed into service due to buying a larger unit at an auction shortly thereafter (he sold it when he eventually needed the space in his shop but wasn't able to find some of the unassembled parts which I obtained from Grizzly for $40 delivered). I then bought the Jointer, then a Grizzly G0123 Table Saw ($650) and most recently a Grizzly G7944 Drill Press ($250).
My recommendation on purchasing used equipment is to search frequently, have a wide search radius (distance) and move on it as soon as you find something you want - particularly if it is at a reasonable price. The best buys don't last long and I learned quickly that they can disappear swiftly. I had each of my Grizzly machines sitting in my shop the same day that it was listed online, and after calling the seller would often research the machine while my wife was driving to the seller's location (ranging from 15 - 100 miles away). Give the machine a thorough look and run some boards through (with the dust collector, it had never been run so we had to wire it up) and if all checks out, buy, load and go.
To put things into another perspective, I saved over $2,500 on the Grizzly equipment I bought used (when shipping is factored in) and I haven't had any issues. To be honest, I never realized I saved that much until I just now compared my machines to the cost of new.