I can offer some advice on the Siglent SDS1052DL.
Looking at my data and pricing, I feel the SDS1072CNL, while being slightly more expensive, is a much better buy.
The SDS1072 has 70 MHz bandwidth, twice the sampling rate at 1 GSs/s and sightly more memory.
Additionally as it seems everyone is into hacking, the CNL version can have the additional memory installed to upgrade it to CML specs(2M).
There is a thread on EEVblog describing this upgrade and the memory chip part number.
I could not recommend this until the warranty has expired.
Reliability.
I have supplied a few dozen Siglent's to the NZ market and have never had any failures.