If you're ready to move beyond your on-board DSLR or ILC camera mic, have a smartphone and are tight on budget this is your next purchase -- even before a shoe-mounted shotgun mic from RØDE itself. I used this setup for my gear reviews until very recently (I sometimes still do if I'm really lazy), having moved up to a pair of RØDElink wireless lavs connected to a TASCAM DR70-D dedicated field audio recorder.. Still, its sub $100 price (at just about 1/4 the price of the RØDElink) the smartLav+ is tough to beat.
Once you start working with lavs, the new challenge is to prevent them from rubbing up against clothing. The invisilav is designed expressly for this purposes, optimized for RØDE's own lav mics including the smartLav+ and the RØDElink kit.
These are my favorite wired lavs, and at under $30 a pop they'll be yours, too. Great sound as long as they're connected to an audio recorder like the TASCAM DR70-D. Yes, the wires are a pain, but there are ways to organize them. Just bring plenty of spare button batteries - and don't make the mistake of forgetting that you or your talent have them on when you're done.
RØDElink Filmmaker Kit
I sold my Sennheiser EW100 G2 kit to buy a pair of these, and they are fantastic. No setup, no squelch control. The only buttons beyond on-off are switchable sensitivity and output levels, executed by real buttons inside the battery compartment cover. Outstanding sound, outstanding convenience, and a very aggressive price. These are part of my standard kit for interviews.
I sold my Zoom H4n to get the DR70-D. It is a much better match for my RØDE NTG2 and NTG4+ (better pre-amp), with twice as many XLR inputs and a superior form factor when working with DSLRs and ILCs. It's great -- and at just under $300, there's actually very little at a sonic level between this and vastly more expensive high end gear. Really!