Are you in the US? What frequency does your system use? How far from the sensors do you have the GW1000 gateway?
Yes, I'm in the US (Phoenix, AZ)
The system uses 915 Mhz (they have different frequencies depending on what country you live in)
This particular system is modular (not an all-in-one), so there are 3 different sensor units (outdoor temp/humidity...rain...UV/solar radiation/wind speed and direction). OK, 4 sensors really, since the unit that receives signals from sensors (similar to Access) also does indoor temp/humidity and barometric pressure. Being modular is great since you can optimize the location for each sensor individually. Atlas did get better with this by having the ability to detach and locate wind from the main unit, but it still had to be within distance of the main body since it is wired. With what I have now, each sensor unit is powered on it's own, so they can be placed in completely different locations.
The rain sensor is currently not mounted. But I did place it temporarily at the location where it will be mounted. About 50 feet away going through 3 walls. I got 4 out of 4 bars.
Temp/humidity is currently about 40 feet away, going through 2 walls. 4/4 bars.
UV/solar rad/wind is currently in the same location that the rain sensor was tested at, but about 7-8 feet in the air. 4/4 bars.
The location that my Atlas is (which is the same location that UV/wind of my Ecowitt is) is not an optimal placement, but it is good enough, as there was already a 4x4 post for a sat dish in the ground at that spot when I bought this house, so that's why I used that spot. I had considered over and over siting at a different spot, but with the issues I have been having with Atlas/Access it seemed like a bit of work for very little improvement. With my new system being SO good, I AM going to re-locate the UV/wind sensor. I'll be putting a new 4x4 in the ground and attaching a 10-12 foot pole. I'd like to go higher, but I live in an HOA and they have restrictions (which technically I'll be breaking, but they won't see it from the road, and none of my neighbors are going to care). Just waiting for it to get a little cooler outside to get to digging (we're currently seeing high temps of 110+).
Regarding signal strength from the sensors. The number of bars you see isn't actually signal "strength", but rather the number of transmissions that was successfully received. I'm seeing 4/4 on everything, so 4 signals sent, 4 received. Even if you see 2/4 bars, you could still have a strong signal, but only 2 were received, so there may be a little interference or something causing a couple transmissions to not reach the receiver. Conversely, you could see 4/4 and still have a weak signal...but all 4 transmissions are getting through.
I think the only thing I'll "miss" about AcuRite is the look of the web interface/app. I really like the way it looks. But, if the data is not good/reliable, then how it looks is pretty irrelevant (function over form). If you are considering a new system, part of my choice for me was how the web interface/app looked. Ecowitt's is not the prettiest, but capturing the data is WAY easier than with AcuRite, so there are ways to "pretty it up". We have multiple cheap tablets placed around the house that we use as a weather display, so how it looks is important to us. We also have a couple cheap tablets around the house that are on 24/7 that we use as monitors for our security cams. I love it when Amazon has a sale on their Fire tablets. They work great for my purposes.