While I do not own an MLA-30, nor a Wellbrook, from the posts I have seen about them (the SDR-Radio mailing list recently had an excruciatingly long thread) by those who have used and compared them, the MLA-30 is not comparable to either a Wellbrook or LZ1AQ loop. Even without testing them, basic economics suggests this is going to be the case.
That's not to say that the MLA-30 or W6LVP may not be useful for some DXers. Maybe they were using the whip antenna on the radio or a random piece of wire laying on the floor in the shack previously. An inexpensive active loop is likely to be better than that, especially if it is now outside. To a large extent the antenna(s) to use depends on your location and situation. You may not have the room for a larger/better antenna. Many DXers unfortunately live in high RFI environments. If your noise floor is huge, it probably does not matter what you use for an antenna.
I am fortunate to live in an RF quiet rural area, with enough land for large, full sized, passive antennas. I did have an LZ1AQ based loop for some time and was impressed with the performance for the size of the antenna. But it does not come close to the performance of my full sized passive antennas, nor do I expect it would for anyone who is not noise floor limited. That's why I never bought a Wellbrook, Pixel, or similar high-end loop, they won't be of any use for me. FWIW the loop in question now functions as a passive loop (I have sensitive enough SDRs that I can make use if it that way) and it is useful in some situations such as on MW where the directivity is a benefit.