Beta's haven't had the rigorous testing that the final releases has had. In general though the betas should be good enough to work with but keep your db backed up a bit more than you would with an official release.
You can look at the release notes of the beta to see what stuff it has in it that won't be in the official release. Here are the things that are in the latest beta
Added:
New Site: Merge
Hand Converter / Hud Hand Display
Multi-currency support
New Stats: Amount Won (Global), Amount Won (Native)
New Stats:
equity %, Equity $ (Holdem Hand)
New Stats: ICM Equity %, ICM Equity $ (Holdem/Omaha Tournament Hand)
Fixed:
Import:
pokerstars: (Mac) Euro hand histories appearing to be lost
Import: PokerStars: Old tournaments being rejected as play money
Import: PokerStars: Pot size error with all-in on BB + ante
Import: PokerStars: Some emailed tournament summaries not importing
Import: iPoker: Locales (Russian) that don't have currency symbols that are expected
Import: Full Tilt: Run-it-twice hands not properly saving second summary in hand history
Import: OnGame: Issues with new rake taken lines
Import: Party: Hero's tournament place win amount was being zeroed out
Import: Old UB: Incorrect results with all-in hands
Import: Old UB: Issues with disconnect all-ins
Import: Cake: Guaranteed tournaments treated as
freerolls
Import: Cereus: HORSE games (Holdem and Omaha hands)
Import: OnGame: New date format
Import: MicroGaming: Some hands not importing
Hud: WPEX: Table detection problems
Hud:
betfair: Crashes
Hud: FullTilt: Rush fixes (PC only)
Hud: Party: Cash game table finding
TableTracker: PokerStars and Full Tilt table opening
TableTracker: Removed sites from list that shouldn't have been there (WPEX, Merge, Betfair)
GUI: Reports: Tooltip issues
GUI: Configure Currency window. Resized and fixed crash on Mac
GUI: Boss: Skins with spaces in their options directory
GUI: Bodog HH folder in Setup Wizard
GUI: Betfair: Save HH's to disk false warning
Graphs: All-in EV fixes (more accurate when dealing with multiple all-ins)
Graphs: Days Played fix (requires rebuild of cache)
Filters: Misc - Stack Size - Absolute filter fix
Stats: SQL comments are now checked for and not permitted
lookup_positions table had too many entries
Added:
EV Calcs for Omaha
All-in EV graph for Omaha
Currency: Session based currency
Changed:
Currency: Configure Currency dialog allows getting the rate of a specific date
Currency: Configure Currency dialog allows setting rates per session
ICM: Use starting chip stack
Fixed:
Graph: Multi-line tooltips
Mac: Details: Exporting to JPG and PNG not saving properly
Mac: TableTracker: Adjusted size of window so start button is visible
Import: Cereus: Including 7-2 prop bets in the pot
Import: Cereus: Deducting prop 7-2 wins from winnings
Import: Cereus: New hand numbers
Import: Merge: Villian mucked cards
Import: Merge: dealing with incorrect button
Import: PokerStars: New bounty tournament buyins
Import: PokerStars: "Added to the prize pool" summary time register problems
Import: Boss: BB/Dead BB detection
Import: Boss: Problems with currencies in locales without pound and euro symbols
Import: OnGame: Tournament hands with "chips" instead of "TC"
Import: Party: BB Min tables importing with wrong limit
Import: Betfair: DST off by 1 hour
Import: iPoker/Merge: Duplicate hands bug in auto-import
Currency: Amount Won (Global) splitting by limit for same currency
Currency: Currency information not being set for new limits
Currency: Issues with Limit Adjust dialog
Hud: Crashes with showing cards from previous hand
GUI: Moving windows when they are opening completely offscreen
ICM: FTOPS style summaries
EV: Calculating EV for sites that don't show losing mucked hands
Cache: Problem with updating if the max hand ID cannot be determined
TableTracker: Placing number of tables in Buddy column
HH Viewer: Problem with INVALID_POS on MicroGaming hands
HH Viewer: Showing wrong bet/chip amounts on tournaments