I've got both a Flea/soprano and a Fluke/concert and have been really happy with both. The both have the molded(polywhatzit) fretboard. My first buy was the Fluke, because it was middle ground size-wise and the durability of these was and is reputed to be fantastic. I'm a campfire guy and a desert rat, so I knew whatever I bought would take it's share of tumbles no matter how careful I was (sober
). It was a good pick and if I had a regret today it would only be that I did not get the rosewood fretboard, but this is a minor one as if/when they wear the mfg will replace for free (and the additional cost at the time was a deal-breaker for me).
I also have the Flea, which I got a little less than 2 years after the Fluke, because I wanted a more 'toyish' or soprano sound. Plus I thought the Tiki design was really cool.
I play and enjoy them both for different styles and sounds. Put a gun to my head and make me choose one over the other, I'd be screwed. I love 'em both. They have both been dropped counter-high nearly half a dozen times and have survived with only a nick or two and still sound as good or better than day one.
As far as the poly vs. rosewood fretboard thing, I would go rosewood if you are willing to part with the upgrade cost and/or you plan to play with WOUND Low G strings. Otherwise, the polywhatzit (both of mine have this) will be fine, just use Worth strings if you choose to go LowG. On the con side of the poly, a few YEARS later both of mine have developed a little wear at the molded 'nut' if you must call it that, and when I bend the C or E string I hear a faint, but annoying 'tick' as the string pops out of a tiny groove that the string has worn in the nut/fret (the poly board has a weird 'zero' fret right next to the nut). Now, I just recently purchased a new traditional style uke, which will occupy my attention exclusively for a while anyways, so I am sending my flea and fluke in to get the poly boards replaced with new poly boards free of charge. I am electing not to upgrade to the rosewood first because the $170 it would cost to upgrade could go towards my next UAS fix, and since I routinely take them both to 'hazardous environments' I want to keep the investment low. One last note on this point, the difference between getting it now and later is only $10, so you could save the money now and decide later.
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Okay, somebody else asked about strings on these also, so here's my take;
My Flea came stock with Hilo's which were a little on the dead side for me. I switched out to Aquilas and that really opened the little guy up -- more volume and the higher string tension felt good. This was great for a quite some time, but after playing them for some time I found that they were too bright, even a little raspy (to me) when you really start jammin' on them. I realized that I leaned towards a more gentle strum to keep the sound sweet. Also, their texture was a little noisy when sliding up/down on the fretboard.
I recently switched to the Worth CM's (Clear, Medium Tension) and I think this is a really good fit. I still have the volume I had with the Aquilas, and they are a smooth finish, so no more finger noise. I can strum gently or hard and they still sound good.
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On to the Fluke -- again I did not like the Hilo's, but on this one I like the LowG tuning, and since Aquila only carries these with a wound LowG, I tried the Worth CM-LG instead (Clear, Medium tension, Low G) so I would not have to use a wound string. The overall volume was a bit weak in this case, also the LowG and C had an unappealing 'thunky' sound.
I switched to the Worth CD-LG (Clear, Denser Tension, Low G) and found my happy place. Good volume, no thunk, a really good fit, so my search is over.
Have fun!