Rat_Power_78, I've run spectra lasers for about 15 years now, had at least three or four of the CR600's with lasers over those years, never had a problem with them at all ever, I've got I believe the GL422 laser as my knock around and prep laser I use for making grade shots when I'm estimating or just getting an idea of what might work or be needed on a job, I have a GL722 for precise work when grade is essential, both are good lasers and have caused me no issues over the years. The 722 is a high end laser and the 422 is the cheaper version, both are dual slope. I'd guess the N series is newer than mine, not sure what they changed from the straight GL422, mine has shutter lock on it, which is nice when I'm running more than one laser on site or I don't want to look at the laser flash when running a machine not using the laser on site and my only complaint about the laser is it ONLY charges with a 12 volt cord, not 110 volt, which to me is a pain in the evening because I can't bring it to the house to warm up and so it can charge, and I can watch it and unhook it when its fully charged from the house, I have to leave it in the shop and find a battery to hook it to, meaning if all I have in the shop overnight are machines with 24 volt I have unhook a battery so I can charge that laser, everything else gets charged in the house where its warm and dry and I can keep an eye on them. I didn't know this when I bought it otherwise I'd have bought two of the GL722's instead, those charge with either 12v or 110.
Both of mine have remotes which is really nice, I'm thinking one CR600 has grade match in it, thought I'd use that a lot turns out I don't and never have.
First when shopping for lasers, find someone locally that fixes them and is good at it, ask if they'll loan you a laser IF yours needs repair, this alone is worth a lot, had some issues years back with a laser what was a lemon and always in the shop and if I'd have had to rent a laser to replace it every time it was in for repairs, I could have bought three instead of one in just rental costs alone, hence the reason why I have two lasers now, I'm never without at least one working laser at all times, even if one is only in to be checked out and recalibrated. If you have to ship your laser anywhere to be fixed, your in deep sh*t, they only ever need repair when you need the laser the worst and it's usually weeks to get it back, not day's or hours.
Yes deals can be had on the internet on new lasers and receivers, but none of those offer repair with free loaners when yours is in for repairs, those also don't offer free shipping both ways to get repaired and a host of other things, I'd shop local and whatever brand that local person to you handles is what I'd buy, most laser makers today have good products, and yes they also have lemons every once in a while too. Best of luck on whatever you decide