I dont see any reason to get a MegaSD if in the market now. Unless you really love a more fanciful UI and total brand loyalty to TerraOnion. I like basic engineering centric UI's myself. All business no play.
But, I also see almost no reason to toss a MegaSD if you already have one and have been happy, because it seems like a great product too that hummed along fine.
Just my 2 cents.
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I went a completely different route. Because NES, SNES, and Genesis/SegaCD are missing from my collection, would cost a small fortune to acquire them and have them maintenanced.
I only have an S-video CRT as well, so I'd have to regressively get a Genesis modded to support that or I'd be pushed into the world of RGB which I'm not sure I'm ready for the cost, either. And I'd be torn between a Model 1 with 'high definition graphics' thats the definitive hardware to get, vs. Model 2 which is what I had growing up.
I could use my retro-access multi-out s-video I use with 64 and GC with a SNES, but then I'd have to hunt for a 1-chip model for best IQ and hopefully find one that doesn't produce jailbars.
NES, I'd be worried about the mechanical piece of the loader breaking as it often does, and if I wanted a toploader I'd need that modded too.
Add in the top end flashcards, you're looking at a hefty bill and a lot of patience to get all these pieces. Nevermind that I am curious about other systems like NeoGeo (which costs a small fortune by itself), and TGX.
Soooooo... I went the MiSTER FPGA route so I don't go broke overnight. And I'm REALLY happy with the performance and end result.
But, if I find myself head over heels in love with one of the systems, I may end up getting that eventually. I just cant foresee myself piling up more consoles than I already have at this point. I'm running out of space too for living an apartment life.
I also have an ED64, ED GB, and ED GBA.
Having said ALL of that, I am jealous of people with SNES and FXPak Pro and Genesis with Mega Everdrive Pro and NES with N8 Pro. Would love to have it all... one day.
I'd even love to go bourgeois and get a fried SegaCD and just disconnect the electrical piece from the Genesis, purely for aesthetic with a Mega Everdrive Pro attached. In that regard, I think the model 1 SegaCD + Genesis stack looks way more badass. Else I'd want to go model 2 by itself for efficient look + personal nostalgia.