I have & still do for the past 9 years used a Sekonic L358
I find not having to 'faff' about with the cameras histogram & just take a test flash & look at the meter is far more reliable as often I want a certain speed & can set the meter to that & find what flash strength I need versus different F values.
'Faffing' about taking several shots & looking a the histogram over & over! No thanks.
Anyhoo to the OP's ?, I have never been let down by the L358, not sure what features your L308B doesn't have compared to my L358 but the L358 has a 90 second window to take a test reading so if you have no remote firing mech you can leave the meter in place & walk to the flash to fire if flash is your need.
The battery in mine has lasted well over 2 years & it's used at least 20 times each week.
It can take the small radio trigger which fits inside with no protrusions.
It's not made by Sekonic anymore but you'll be hard pressed to find any on eBay UK there are some average at £150 from the states
to me this shows how good they are if not many for sale on eBay, loads of L308s there though, having said that the 308 is still made, the 358 has become well not sure but there are some pretty fancy, and costly new versions with touch screens etc.
The L358 has these features for you to compare with your existing one or other makes...
Measuring System Incident: Dual retractable lumisphere, Reflected: with included reflected light attachment; Silicon photo diodes Measuring Modes Ambient and flash (cord, cordless, multi flash) – incident and reflected (54 degrees)
Receptor Head Rotating 270 degree with built-in retractable lumisphere Aperture/Shutter Priority Aperture and shutter priority Display Readout Digital LCD plus LCD analog, (auto-backlit LCD at EV 3 and under for 20 sec.)
ISO Range Dual ISO settings: 3 to 8000 (1/3rd steps) f/Stop Display Range
Incident/Reflected: f/1.0 to 90 9/10 (full, 1/2 or 1/3rd steps)
Shutter Speed – Ambient 1/8000 sec. to 30 minutes Shutter Speed – Flash 1/1000 sec to 30 minutes EV Range (ISO-100)
Flash: EV -2 to 22.9 (Incident/Reflected) Cine Speeds 2 – 360fps
Exposure Memory Capable of nine exposure measurement readings Shadow/Highlight Calculation Yes Brightness Difference Displays the difference in 1/10 stop increments Flash to Ambient Ratio Yes Multiple Flash Yes, unlimited Exposure Calibration +/- 1.0 EV
Power Source 1 CR123A lithium battery Dimensions 2.4 x 6.1 x 1.46″ (60 x 155 x 37mm) WHD Weight 5.4 oz (154g) Specialties All weather design;
Radio triggering with optional RT-32 Radio Transmitter Module (max. distance is 100ft);
Compatible with PocketWizard Digital Radio Receivers; 16 standard PocketWizard Channels (#1-16) and 16 “Selective Quad Triggering” multi-zone channels (#17-32) are accessed through the meter’s integral software and displayed on its LCS panel.
In Selective Quad, up to 4 zones of lighting can be individually triggered and measured wirelessly by the meter
Read more at
http://www.thephoblographer.com/2012/01/22/review-sekonic-l-358-light-meter/#fgHVPFce2si8KPhI.99