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I skipped the Garmin x20 series, as they seemed to have a lot of problems. Garmin hasn't made the 520 Plus model for quite a while now, and there are plenty still for sale despite having been very heavily discounted for a long time. I think that probably tells you everything you need to know about them. I've currently got a 530 which I've been impressed with so far. It's a bit fiddly to set up, and the button layout isn't exactly intuitive, but it's stable and the battery life is impressive.
As for the Wahoos, the original Elemnt is excellent with one massive flaw - of the four I've had (2 original purchases, 2 replacements) the altimeter has gone screwy on all of them. It just generates totally random numbers, and becomes utterly useless after a while. I think it's because the ports on the rear of the device for the barometric and temperature sensors get blocked, and there's no practical way to clear them. Apart from that they're excellent, but it's a major flaw.
The Wahoo Bolt doesn't seem to suffer from this, but the screen is very small for navigating. You can use it for navigating pre-loaded routes, and it works OK, but the lack of screen size can become an issue particularly if you have to deviate off the planned route.
For navigating, I'd go with the 530. Although I've never used a 520Plus myself, everyone I know who's got one thinks they're bobbins.
And if you're not interested in HRM, I wouldn't bother with the sensor bundle. The GPS is fine for speed/distance 99% of the time.
Yeah that is a fair point - I am very much a road not off-road cyclist so can't really comment on that side of things